7544 Group
REJ03B0012-0104Z
Rev.1.04
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
2004.06.08
DESCRIPTION
• Clock generating circuit............................................. Built-in type
(low-power dissipation by an on-chip oscillator enabled)
(connect to external ceramic resonator or quartz-crystal oscilla-
tor permitting RC oscillation)
The 7544 Group is the 8-bit microcomputer based on the 740 fam-
ily core technology.
The 7544 Group has a serial I/O, 8-bit timers, a 16-bit timer, and
an A/D converter, and is useful for control of home electric appli-
ances and office automation equipment.
• Watchdog timer ............................................................ 16-bit ✕ 1
• Power source voltage
X
IN oscillation frequency at ceramic/quartz-crystal oscillation, in
FEATURES
double-speed mode
• Basic machine-language instructions ...................................... 71
• The minimum instruction execution time ......................... 0.25 µs
(at 8 MHz oscillation frequency, double-speed mode for the
shortest instruction)
At 8 MHz .................................................................... 4.5 to 5.5 V
XIN oscillation frequency at ceramic/quartz-crystal oscillation, in
high-speed mode
At 8 MHz .................................................................... 4.0 to 5.5 V
XIN oscillation frequency at RC oscillation
• Memory size ROM......................................................... 8 K bytes
RAM ........................................................ 256 bytes
At 4 MHz .................................................................... 4.0 to 5.5 V
• Power dissipation ........................................... 22.5mW(standard)
• Operating temperature range................................... –20 to 85 °C
• Programmable I/O ports ........................................................... 25
• Interrupts ................................................. 12 sources, 12 vectors
• Timers ............................................................................. 8-bit ✕ 2
...................................................................................... 16-bit ✕ 1
• Serial I/O...................... 8-bit ✕ 1 (UART or Clock-synchronized)
• A/D converter ................................................. 8-bit ✕ 6 channels
APPLICATION
Office automation equipment, factory automation equipment,
home electric appliances, consumer electronics, etc.
PIN CONFIGURATION (TOP VIEW)
1
32
P1
P1
P1 /CNTR
2
/SCLK
P1
P1
P0
P0
P0
P0
P0
P0
P0
P0
1
0
7
6
5
/T
/R
X
D
D
2
3
4
5
31
30
29
28
3/SRDY
X
4
0
0
1
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
7
6
5
)
)
)
)
P2
0
/AN
/AN
/AN
/AN
/AN
/AN
P2
P2
P2
P2
P2
1
6
7
8
27
26
25
2
3
4
5
2
3
4
5
4
3
4
3
)/TXOUT
)
)
2
1
0
2
1
0
9
10
11
12
24
23
22
21
V
REF
)/CNTR
1
P3
P3
P3
P3
P3
P3
7
(LED13)/INT
4
0
RESET
CNVSS
(LED12)/INT
1
13
14
15
16
20
19
18
17
V
CC
IN
OUT
SS
3
2
1
0
(LED11
(LED10
(LED
(LED
)
)
X
X
9
8
)
)
V
Package type : 32P4B
Fig. 1 Pin configuration (32P4B type)
Rev.1.04 2004.06.08 page 1 of 66
REJ03B0012-0104Z