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CHAPTER 22 RESET FUNCTION
User’s Manual U12790EJ2V0UD
Table 22-1. Hardware Status After Reset (1/3)
Hardware
Status After Reset
Program counter (PC)Note 1
Contents of reset
vector table (0000H,
0001H) are set.
Stack pointer (SP)
Undefined
Program status word (PSW)
Undefined
RAM
Data memory
UndefinedNote 2
General-purpose register
UndefinedNote 2
Ports (output latches)
Ports 0, 2, 3, 7, 10, 12, 13 (P0, P2, P3, P7, P10, P12, P13)
00H
Ports 4 to 6 (P4 to P6)
Undefined
Port mode registers (PM0, PM2 to PM7, PM10, PM12)
FFH
Processor clock control register (PCC)
04H
Oscillation stabilization time select register (OSTS)
04H
Memory size select register (IMS)
CFHNote 3
Internal expansion RAM size select register (IXS)
0CHNote 4
16-bit timer/event counter 0
Timer register (TM0)
0000H
Capture/compare registers 00, 01 (CR00, CR01)
Undefined
Mode control register 0 (TMC0)
00H
Prescaler mode register 0 (PRM0)
00H
Capture/compare control register 0 (CRC0)
00H
Output control register 0 (CRC0)
00H
8-bit timer/event counters
Counters 50, 51 (TM50, TM51)
00H
50, 51
Compare registers 50, 51 (CR50, CR51)
Undefined
Clock select registers 50, 51 (TCL50, TCL51)
00H
Mode control registers 50, 51 (TMC50, TMC51)
00H
Notes 1. During reset input or oscillation stabilization time wait, only the PC contents among the hardware
statuses become undefined. All other hardware statuses remain unchanged after reset.
2. The status before reset is held even after reset in the standby mode.
3. The initial value is CFH. Set the following value to this register according to the product.
PD178076, 178096A: CCH
PD178078, 178098A: CFH
PD178F098:
Value corresponding to mask ROM version
4. The initial value is 0CH. Set the following value to this register according to the product.
PD178076, 178096A: 0AH
PD178078, 178098A: 08H
PD178F098:
Value corresponding to mask ROM version