HD404669 Datasheet, PDF (21/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
Table 1 Initial Values After MCU Reset
Item
Program
counter
Status flag
Stack pointer
Interrupt
flags/mask
I/O
Timer/
counters,
serial
interface
Abbr.
(PC)
Interrupt enable flag
Interrupt request flag
Interrupt mask
Port data register
Data control register
Data control register
Data control register
Data control register
Data control register
Port mode register A
Port mode register B
Port mode register C
bits 3, 1, 0
Detection Edge select
registers 1 and 2
Timer mode register A
(ST)
(SP)
(IE)
(IF)
(IM)
(PDR)
(DCD0)
(DCD1)
(DCD2)
(DCR0–DCR4,
DCR6–DCR9)
(DCRA)
(PMRA)
(PMRB)
(PMRC3,
PMRC1,
PMRC0)
(ESR1, 2)
(TMA)
Timer mode register C1
Timer mode register C2
Timer mode register D1
Timer mode register D2
Serial mode register 1A
(TMC1)
(TMC2)
(TMD1)
(TMD2)
(SM1A)
Serial mode register 1B (SM1B)
Prescaler S
Prescaler W
Timer counter A
Timer counter C
Timer counter D
(PSS)
(PSW)
(TCA)
(TCC)
(TCD)
Initial
Value
$0000
1
$3FF
0
0
1
All bits 1
0000
--00
000-
0000
--00
--00
0000
00-
0000
0000
0000
-000
0000
0000
0000
--X0
$000
$00
$00
$00
$00
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 R port
Refer to description of port mode register C
Refer to description of interrupts
Refer to description of timer mode register A
section
Refer to description of timer mode register C1
Refer to description of timer mode register C2
Refer to description of timer mode register D1
Refer to description of timer mode register D2
Refer to description of serial mode register
1A
Refer to description of serial mode register
1B
Refer to description of prescalers
Refer to description of prescalers
Refer to description of timer A
Refer to description of timer C
Refer to description of timer D
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