HD404654 Datasheet, PDF (7/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

Block Diagram
HD404654 Series
INT 0
INT 1
External
interrupt
Timer
A
TOC
EVND
TOD
SI 1
SO 1
SCK 1
VCref
COMP 0
COMP 1
VTref
TONER
TONEC
Timer
C
Timer
D
SCI1
Compa-
rator
DTMF
System control
RAM
(512 × 4 bits)
W (2 bits)
X (4 bits)
SPX (4 bits)
Y (4 bits)
SPY (4 bits)
ALU
CPU
ST CA
(1 bit) (1 bit)
A (4 bits)
B (4 bits)
SP (10 bits)
Instruction
decoder
PC (14 bits)
ROM
(4,096 × 10 bits)
(2,048 × 10 bits)
D0
D1
D2
Source
D3
D4
D5
D6
D7
Sink
High
current
pins
D8
D9
D12
D13
R0₀
R10
R11
R12
R13
R2 0
R2 1
R2 2
R2 3
R3 0
R3 1
R3 2
R3 3
R4 0
R4 1
R4 2
R4 3
RD0
RD1
RE0
: Data bus
: Signal line
5