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CHAPTER 24 RESET FUNCTION
Table 24-1. Hardware Status after Reset (1/2)
Hardware Status after Reset
Program counter (PC)
Note1
The contents of reset vector
tables (0000H and 0001H)
are set.
Stack pointer (SP) Undefined
Program status word (PSW) 02H
Data memory Undefined
Note2
General register Undefined
Note2
Ports 0 to 3, Port 7, Port 12, Port 13 00H
(P0 to P3, P7, P12, P13)
Ports 4 to 6 (P4 to P6) Undefined
Port mode register (PM0 to PM3, PM5 to PM7, PM12, PM13) FFH
Pull-up resistor option register (PUOH, PUOL) 00H
Processor clock control register (PCC) 04H
Oscillation mode selection register (OSMS) 00H
Memory size switching register (IMS)
Note3
Internal expansion RAM size switching register (IXS)
Note4
0AH
Memory expansion mode register (MM) 10H
Oscillation stabilization time select register (OSTS) 04H
Timer register (TM0) 0000H
Capture/compare register (CR00, CR01) Undefined
Clock selection register (TCL0) 00H
Mode control register (TMC0) 00H
Capture/compare control register 0 (CRC0) 04H
Output control register (TOC0) 00H
Timer register (TM1, TM2) 00H
Compare registers (CR10, CR20) Undefined
Clock select register (TCL1) 00H
Mode control registers (TMC1) 00H
Output control register (TOC1) 00H
16-bit timer/event counter
8-bit timer/event counter
1 and 2
Notes 1. During reset input or oscillation stabilization time wait, only the PC contents among the hardware
statuses become undefined. All other hardware statuses remains unchanged after reset.
2. When reset in the standby mode, the state before reset is held even after reset.
3. The values after reset depend on the product.
µ
PD78052, 78052Y : 44H,
µ
PD78053, 78053Y : C6H,
µ
PD78054, 78054Y : C8H,
µ
PD78P054 : C8H,
µ
PD78055, 78055Y : CAH,
µ
PD78056, 78056Y : CCH,
µ
PD78058, 78058Y : CFH,
µ
PD78P058, 78P058Y: CFH
4. Provided only in the
µ
PD78058, 78058Y, 78P058, and 78P058Y.
Port (Output latch)
RAM