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CHAPTER 21 RESET FUNCTION
User’s Manual U15798EJ2V0UD
Table 21-1. Hardware Statuses After Reset (1/2)
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)
02H
RAM
Data memory
Undefined
Note 2
General-purpose register
Undefined
Note 2
Port (output latch)
00H
Port mode registers (PM0, PM2 to PM4, PM8 to PM11)
FFH
Pull-up resistor option registers (PU0, PU2 to PU4)
00H
Pin function switching registers (PF8 to PF11)
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
Subclock select register (SSCK)
00H
Oscillation stabilization time select register (OSTS)
04H
16-bit timer/event counter 0
Timer counter 0 (TM0)
0000H
Capture/compare registers 00, 01 (CR00, CR01)
Undefined
Prescaler mode register 0 (PRM0)
00H
Mode control register 0 (TMC0)
00H
Capture/compare control register 0 (CRC0)
00H
Output control register 0 (TOC0)
00H
8-bit timer/event counters A0, B0
Timer counters (TMA0, TMB0)
00H
Compare registers (CRA0, CRB0, CRHB0)
Undefined
Mode control registers (TMCA0, TMCB0)
00H
Carrier generator output control register B0 (TCAB0)
00H
8-bit timer/event counters 50, 51
Timer counters (TM50, TM51)
00H
Compare registers (CR50, CR51)
Undefined
Clock select registers (TCL50, TCL51)
00H
Mode control registers (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.
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, use the following value to be set for each version.
µ
PD780343, 780353, 780343Y, 780353Y: 46H
µ
PD780344, 780354, 780344Y, 780354Y: 48H
µ
PD78F0354, 78F0354Y: C8H or value for mask ROM versions
4.
Although the initial value is 0CH, use this register with a setting of 0BH.
Содержание mPD780344 Series
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