NEC PD78F9488 User Manual
Page 317
CHAPTER 18 RESET FUNCTION
User’s Manual U15331EJ4V1UD
317
Table 18-1. Status of Hardware After Reset (1/2)
Hardware
Status After Reset
Program counter (PC)
Note 1
Contents of reset
vector table (0000H,
0001H) set
Stack pointer (SP)
Undefined
Program status word (PSW)
02H
Data memory
Undefined
Note 2
RAM
General-purpose registers
Undefined
Note 2
Ports (P0 to P3, P5, P8
Note 3
) (output latches)
00H
Port mode registers (PM0 to PM3, PM5, PM8
Note 3
) FFH
Port function registers (PF7, PF8)
00H
Pull-up resistor option registers (PUB0 to PUB3)
00H
Processor clock control register (PCC)
02H
Subclock oscillation mode register (SCKM)
00H
Subclock selection register (SSCK)
Retained
Note 4
Subclock control register (CSS)
00H
Oscillation stabilization time selection register (OSTS)
04H
Timer counter (TM20)
0000H
Compare register (CR20)
FFFFH
Mode control register (TMC20)
00H
16-bit timer 20
Capture register (TCP20)
Undefined
Timer counters (TM50, TM60, TM61)
00H
Compare registers (CR50, CR60, CRH60, CR61, CRH61)
Undefined
Mode control registers (TMC50, TMC60, TMC61)
00H
8-bit timer 50, 60, 61
Carrier generator output control register (TCA60)
00H
Mode control register (WTM)
00H
Watch timer
Interrupt time selection register (WTIM)
00H
Clock selection register (WDCS)
00H
Watchdog timer
Mode register (WDTM)
00H
Serial operation mode register (CSIM20)
00H
Asynchronous serial interface mode register (ASIM20)
00H
Asynchronous serial interface status register (ASIS20)
00H
Baud rate generator control register (BRGC20)
00H
Transmit shift register (TXS20)
FFH
Serial interface 20
Receive buffer register (RXB20)
Undefined
Notes 1. While a reset signal is being input, and during the oscillation stabilization period, only the contents of the
PC will be undefined; the remainder of the hardware will be the same state as after reset.
2. In standby mode, RAM enters the hold state after reset.
3. Port 8 is used only when the port function is specified by a mask option or port function register (refer
to CHAPTER 20 MASK OPTIONS and 4.3 (3) Port function registers).
4. The register is set to 00H only by RESET input.