HD404318 Datasheet, PDF (11/68 Pages) Hitachi Semiconductor – 4-bit HMCS400-series microcomputer

RAM MemoryMap
$000
$040
$050
RAM-mapped registers
Memory registers (MR)
Data (304 digits)
$180
Not used
$3C0
$3FF
Stack (64 digits)
HD404318 Series
$000
$003
$004
$005
$006
$007
$008
$009
$00A
$00B
$00C
$00D
$00E
$00F
Initial values
after reset
Interrupt control bits area
Port mode register A (PMRA) W
0000
Serial mode register
(SMR) W
0000
Serial data register lower (SRL) R/W ^Undefined
Serial data register upper (SRU) R/W Undefined
Timer mode register A (TMA) W
-000
Timer mode register B1 (TMB1) W
0000
Timer B
(TRBL/TWBL) R/W ^*2/0000 ^*1
(TRBU/TWBU) R/W Undefined
Miscellaneous register (MIS) W
00--
Timer mode register C (TMC) W
0000
Timer C
(TRCL/TWCL) R/W ^*2/0000
(TRCU/TWCU) _R/W Undefined
Not used
$016 A/D channel register
(ACR) W
$017 A/D data register lower (ADRL) R
$018 A/D data register upper (ADRU) R
$019 A/D mode register 1 (AMR1) W
$01A A/D mode register 2 (AMR2) W
-000
0000
1000
0000
--00
Not used
$020
$023
Register flag area
$024 Port mode register B (PMRB) W
$025 Port mode register C (PMRC) W
$026 Timer mode register B2 (TMB2) W
0000
00-0
-000
Notes: 1. Two registers are mapped
on the same area ($00A,
$00B, $00E, $00F).
2. Undefined.
R: Read only
W: Write only
R/W: Read/write
Not used
$030 Port R0 DCR
(DCR0) W
Not used
$033 Port R3 DCR
$034 Port R4 DCR
(DCR3) W
(DCR4) W
0000
0000
0000
Not used
$03F
$00A Timer read register B lower (TRBL) R Timer write register B lower (TWBL) W
$00B Timer read register B upper (TRBU) R Timer write register B upper (TWBU) W
$00E Timer read register C lower (TRCL) R Timer write register C lower (TWCL) W
$00F Timer read register C upper (TRCU) R Timer write register C upper (TWCU) W
Figure 2 RAM Memory Map and Initial Values
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