HD404459 Datasheet, PDF (7/122 Pages) Renesas Technology Corp – 4-bit HMCS400-series microcomputers

Block Diagram
HD404459 Series
INT ₀
INT ₁
INT ₂
INT ₃
WU₀
to
WU₇
EVNB
TOB
TOC
EVND
TOD
SI
SO
SCK
VCref
COMP₀
COMP₁
COMP₂
COMP₃
External
interrupt
Timer
A
Timer
B
Timer
C
Timer
D
Serial
interface
Compa-
rator
System control
RAM
(512 × 4 bits)
(768 × 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
(8,192 × 10 bits)
(16,384 × 10 bits)
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
R0
R0
R0
R0
0
1
2
3
R1
R1
R1
R1
0
1
2
3
R2
R2
R2
R2
0
1
2
3
R3
R3
R3
R3
0
1
2
3
R4
R4
R4
R4
0
1
2
3
R5
R5
R5
R5
0
1
2
3
R6
R6
R6
R6
0
1
2
3
R7
R7
R7
R7
0
1
2
3
R8
R8
R8
R8
0
1
2
3
R9
R9
R9
R9
0
1
2
3
RA
RA
RA
RA
0
1
2
3
5