HD404344R Datasheet, PDF (25/102 Pages) Renesas Technology Corp – 4-bit microcomputer has an A/D converter

HD404344R Series/HD404394 Series
Table 1 Initial Values After MCU Reset
Item
Program counter
Abbr.
(PC)
Initial Value
$0000
Status flag
Stack pointer
Interrupt
flags/mask
Interrupt enable flag
Interrupt request flag
(ST)
(SP)
(IE)
(IF)
1
$3FF
0
0
Interrupt mask
(IM)
1
I/O
Port data register
(PDR)
All bits 1
Data control register (DCD0, DCD1) All bits 0
Port mode register A
(DCR0,- DCR3) All bits 0
(PMRA)
- 000
Port mode register B (PMRB)
0--0
Port mode register C (PMRC)
---0
Timer/
Timer mode register B1 (TMB1)
counters, serial
interface
Timer mode register B2 (TMB2)
0000
- - 00
Timer mode register C (TMC)
0000
Serial mode register (SMR)
0000
Prescaler S
Timer counter B
Timer counter C
Timer write register B
Timer write register C
Octal counter
(PSS)
$000
(TCB)
$00
(TCC)
$00
(TWBU, TWBL) $X0
(TWCU, TWCL) $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 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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