Rainbow Electronics ATmega162V - Manual (Page 259)

259
ATmega162/V
2513E–AVR–09/03
Figure 112. Virtual Flash Page Read Register
Programming Algorithm All references below of type “1a”, “1b”, and so on, refer to Table 112.
Entering Programming Mode 1. Enter JTAG instruction AVR_RESET and shift one in the Reset Register.
2. Enter instruction PROG_ENABLE and shift 1010_0011_0111_0000 in the Pro-
gramming Enable Register.
Leaving Programming Mode 1. Enter JTAG instruction PROG_COMMANDS.
2. Disable all programming instructions by using no operation instruction 11a.
3. Enter instruction PROG_ENABLE and shift 0000_0000_0000_0000 in the Pro-
gramming Enable Register.
4. Enter JTAG instruction AVR_RESET and shift 0 in the Reset Register.
Performing Chip Erase 1. Enter JTAG instruction PROG_COMMANDS.
2. Start Chip Erase using programming instruction 1a.
3. Poll for Chip Erase complete using programming instruction 1b, or wait for
t
WLRH_CE
(refer to Table 108 on page 243).
Programming the Flash Before programming the Flash a Chip Erase must be performed. See “Performing Chip
Erase” on page 259.
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Flash write using programming instruction 2a.
3. Load address high byte using programming instruction 2b.
4. Load address low byte using programming instruction 2c.
5. Load data using programming instructions 2d, 2e and 2f.
6. Repeat steps 4 and 5 for all instruction words in the page.
7. Write the page using programming instruction 2g.
TDI
TDO
D
A
T
A
Flash
EEPROM
Fuses
Lock Bits
STROBES
ADDRESS
State
Machine