MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
• Carrier wave output function (port CARR)
f(XIN), f(XIN)/4, f(XIN)/8, f(XIN)/12
f(XIN)/64, f(XIN)/96, “H” output fixed
• Logic operation function (XOR, OR, AND)
• RAM back-up function
DESCRIPTION
The 4280 Group is a 4-bit single-chip microcomputer designed
with CMOS technology for remote control transmitters. The 4280
Group has 7 carrier waves and enables fabrication of 8 × 7 key
matrix.
• Key-on wakeup function (ports D7, E0–E2, G0–G3) ............. 8
• I/O port (ports D, E, G, CARR) .......................................... 16
• Oscillation circuit ..................................... Ceramic resonance
• Watchdog timer
• Power-on reset circuit
• Voltage drop detection circuit ......................... Typical:1.50 V
FEATURES
• Number of basic instructions ............................................. 62
• Minimum instruction execution time ............................ 8.0 µs
(at f(XIN) = 4.0 MHz, system clock = f(XIN)/8, VDD=3.0 V)
• Supply voltage ................................................. 1.8 V to 3.6 V
• Subroutine nesting ..................................................... 4 levels
• Timer
APPLICATION
Various remote control transmitters
Timer 1 ................................................................... 8-bit timer
with a reload register and carrier wave output auto-control
function
ROM (PROM) size
RAM size
Product
Package
ROM type
(× 9 bits)
(× 4 bits)
32 words
32 words
32 words
32 words
M34280M1-XXXFP
M34280M1-XXXGP
M34280E1FP
1024 words
1024 words
1024 words
1024 words
20P2N-A
20P2E/F-A
20P2N-A
Mask ROM
Mask ROM
One Time PROM
One Time PROM
M34280E1GP
20P2E/F-A
PIN CONFIGURATION (TOP VIEW)
M34280M1-XXXFP/GP
V
SS
1
2
V
DD
20
19
18
17
16
15
14
13
12
11
CARR
E
2
D
D
0
1
3
E
1
4
X
IN
D
D
D
D
2
3
5
X
OUT
E
G
G
0
0
1
6
4
5
7
8
D
D
6
7
G
2
9
G
3
10
Outline 20P2N-A
20P2E/F-A
MITSUBISHI [ Mitsubishi Group ]
