HD404356 Datasheet, PDF (15/100 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404358 Series
Table 1 Initial Values After MCU Reset
Item
Program counter
Abbr.
(PC)
Status flag
Stack pointer
Interrupt
Interrupt enable flag
flags/mask
Interrupt request flag
(ST)
(SP)
(IE)
(IF)
Interrupt mask
(IM)
I/O
Port data register
(PDR)
Data control register
(DCD0 –
DCD1)
(DCD2)
(DCR0 –
DCR4,
DCR8)
Port mode register A
(PMRA)
Port mode register B bits (PMRB2 –
2–0
PMRB0)
Port mode register C
(PMRC)
Timer/
counters,
serial
interface
Timer mode register A (TMA)
Timer mode register B1 (TMB1)
Timer mode register B2 (TMB2)
Timer mode register C (TMC)
Serial mode register
(SMR)
Prescaler S
Timer counter A
Timer counter B
Timer counter C
Timer write register B
Timer write register C
Octal counter
(PSS)
(TCA)
(TCB)
(TCC)
(TWBU,
TWBL)
(TWCU,
TWCL)
Initial Value
$0000
1
$3FF
0
0
1
All bits 1
All bits 0
---0
All bits 0
0000
000
00 - 0
- 000
0000
- 000
0000
0000
$000
$00
$00
$00
$X0
$X0
000
Contents
Indicates program execution point
from start address of ROM area
Enables conditional branching
Stack level 0
Inhibits all interrupts
Indicates there is no interrupt
request
Prevents (masks) interrupt requests
Enables output at level 1
Turns output buffer off (to high
impedance)
Refer to description of port mode
register A
Refer to description of port mode
register B
Refer to description of port mode
register C
Refer to description of timer mode
register A
Refer to description of timer mode
register B1
Refer to description of timer mode
register B2
Refer to description of timer mode
register C
Refer to description of serial mode
register
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