
CHAPTER 22 RESET FUNCTION
436
User
’
s Manual U14260EJ3V1UD
Table 22-1. Hardware Statuses After Reset Acknowledgment (1/2)
Hardware
Status After Reset
Acknowledgment
Note 1
Program counter (PC)
Contents of reset vector table
(0000H, 0001H) are set.
Stack pointer (SP)
Undefined
Program status word (PSW)
02H
RAM
Data memory
Undefined
Note 2
General-purpose registers
Undefined
Note 2
Port registers 0 to 8 (P0 to P8) (output latches)
00H (undefined only for P1)
Port mode registers 0, 2 to 8 (PM0, PM2 to PM8)
FFH
Pull-up resistor option registers 0, 2 to 8 (PU0, PU2 to PU8)
00H
Processor clock control register (PCC)
04H
Memory size switching register (IMS)
CFH
Note 3
Internal expansion RAM size switching register (IXS)
0CH
Note 4
Memory expansion mode register (MEM)
00H
Memory expansion wait setting register (MM)
10H
Oscillation stabilization time select register (OSTS)
04H
16-bit timer/event counters
Timer counters 00, 01 (TM00, TM01)
0000H
00, 01
Capture/compare registers 000, 001, 010, 011
(CR000, CR001, CR010, CR011)
Undefined
Prescaler mode registers 00, 01 (PRM00, PRM01)
00H
Capture/compare control registers 00, 01 (CRC00, CRC01)
00H
Mode control registers 00, 01 (TMC00, TMC01)
00H
Output control registers 00, 01 (TOC00, TOC01)
00H
8-bit timer/event counters
Timer 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
Watch timer
Operation mode register (WTM)
00H
Watchdog timer
Clock select register (WDCS)
00H
Mode register (WDTM)
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.
When a reset is executed in the standby mode, the pre-reset status is held even after reset.
3.
Although the initial value is CFH, set the following value for each version.
μ
PD780076, 780076Y:
CCH
μ
PD780078, 780078Y:
CFH
μ
PD78F0078, 78F0078Y: Value for mask ROM versions
4.
Although the default value of this register is 0CH, initialize this register to 0AH.