參數(shù)資料
型號(hào)： HD4074654S
廠商： Hitachi,Ltd.
英文描述： 4-Bit Single-Chip Microcomputer
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 15/109頁(yè)
文件大?。?/td> 430K
代理商： HD4074654S
HD404654 Series
15
Table 1 Initial Values After MCU Reset
Item
Abbr.
Initial Value Contents
Program counter
(PC)
$0000
Indicates program execution point
from start address of ROM area
Status flag
(ST)
1
Enables conditional branching
Stack pointer
(SP)
$3FF
Stack level 0
Interrupt
flags/mask
Interrupt enable flag
(IE)
0
Inhibits all interrupts
Interrupt request flag
(IF)
0
Indicates there is no interrupt request
Interrupt mask
(IM)
1
Prevents (masks) interrupt requests
I/O
Port data register
(PDR)
All bits 1
Enables output at level 1
Data control register
(DCD0–
DCD2)
All bits 0
Turns output buffer off (to high
impedance)
(DCR0–
DCR4)
All bits 0
Port mode register A
(PMRA)
- - 00
Refer to description of port mode
register A
Port mode register B
(PMRB)
- - - 0
Refer to description of port mode
register B
Port mode register C
bits 3, 1, 0
(PMRC3,
PMRC1,
PMRC0)
000 -
Refer to description of port mode
register C
Detection edge select
register 2
(ESR2)
00 - -
Disables edge detection
Timer/counters,
serial interface
Timer mode register A (TMA)
- 000
Refer to description of timer mode
register A
Timer mode register
C1
(TMC1)
0000
Refer to description of timer mode
register C1
Timer mode register
C2
(TMC2)
- 000
Refer to description of timer mode
register C2
Timer mode register
D1
(TMD1)
0000
Refer to description of timer mode
register D1
Timer mode register
D2
(TMD2)
0000
Refer to description of timer mode
register D2
Serial mode register
1A
(SM1A)
0000
Refer to description of serial mode
register 1A
Serial mode register
1B
(SM1B)
- - X0
Refer to description of serial mode
register 1B
Prescaler S
(PSS)
$000
—
Timer counter A
(TCA)
$00
—
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