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DS4830 User’s Guide
6
SECTION 18
– HARDWARE MULTIPLIER MODULE ....................................................................................................... 140
18.1
– Hardware Multiplier Organization ......................................................................................................................... 140
18.2
– Hardware Multiplier Controls ................................................................................................................................ 140
18.3
– Register Output Selection..................................................................................................................................... 141
18.3.1
– Signed-Unsigned Operand Selection ............................................................................................................ 141
18.3.2
– Operand Count Selection .............................................................................................................................. 141
18.4
– Hardware Multiplier Operations ............................................................................................................................ 141
18.4.1
– Accessing the Multiplier ................................................................................................................................. 141
18.5
– Hardware Multiplier Peripheral Registers ............................................................................................................. 142
18.6
– Hardware Multiplier Examples .............................................................................................................................. 145
SECTION 19
– WATCHDOG TIMER.................................................................................................................................. 146
19.1 - Overview ............................................................................................................................................................... 146
19.2
– Watchdog Timer Description ................................................................................................................................ 146
19.2.1
– Watchdog Timer Interrupt Operation ............................................................................................................. 147
19.2.2
– Watchdog Timer Reset Operation ................................................................................................................. 147
19.2.3
– Watchdog Timer Applications ........................................................................................................................ 147
SECTION 20
– TEST ACCESS PORT (TAP) ..................................................................................................................... 149
20.1
– TAP Controller ...................................................................................................................................................... 150
20.2
– TAP State Control ................................................................................................................................................. 151
20.2.1
– Test-Logic-Reset............................................................................................................................................ 151
20.2.2
– Run-Test-Idle ................................................................................................................................................. 151
20.2.3
– IR-Scan Sequence ......................................................................................................................................... 151
20.2.4
– DR-Scan Sequence ....................................................................................................................................... 152
20.3
– Communication via TAP ....................................................................................................................................... 152
20.3.1 - TAP Communication Examples
– IR-Scan and DR-Scan .............................................................................. 153
SECTION 21
– IN-CIRCUIT DEBUG MODE ...................................................................................................................... 155
21.1
– Background Mode Operation ............................................................................................................................... 156
21.1.1
– Breakpoint Registers ..................................................................................................................................... 157
21.1.2
– Using Breakpoints .......................................................................................................................................... 159
21.2
– Debug Mode ......................................................................................................................................................... 160
21.2.1
– Debug Mode Commands ............................................................................................................................... 160
21.2.2
– Read Register Map Command Host-ROM Interaction .................................................................................. 162
21.2.3
– Single Step Operation (Trace) ....................................................................................................................... 163
21.2.4
– Return ............................................................................................................................................................ 164
21.2.5
– Debug Mode Special Considerations ............................................................................................................ 164
21.3
– In-Circuit Debug Peripheral Registers .................................................................................................................. 165
SECTION 22
– IN-SYSTEM PROGRAMMING .................................................................................................................. 169
22.1
– Detailed Description ............................................................................................................................................. 169
22.1.1 - Password Protection ....................................................................................................................................... 170
22.1.2
– Entering JTAG Bootloader ............................................................................................................................. 170
22.1.3
– Entering I2C Bootloader ................................................................................................................................ 171
22.2
– Bootloader Operation ........................................................................................................................................... 171
