DESCRIPTION
The 38C1 group is the 8-bit microcomputer based on the 740 fam-
ily core technology.
The 38C1 group has the LCD drive control circuit, an 8-channel A-
D converter, and serial I/O as additional functions.
The various microcomputers in the 38C1 group include variations
of internal memory size and packaging. For details, refer to the
section on part numbering.
FEATURES
•
Basic machine-language instructions ....................................... 71
•
The minimum instruction execution time ............................ 0.5 µs
(at 8 MHz oscillation frequency)
•
Memory size
ROM ................................................................ 16 K to 24 K bytes
RAM ................................................................... 384 to 512 bytes
•
Programmable input/output ports (Ports P2–P6) ..................... 30
•
Segment output pin/Input port (Port P0) ....................................... 8
•
Software pull-up/pull-down resistor....................... Ports P0, P2–P6
•
Interrupts .................................................. 13 sources, 13 vectors
(includes key input interrupt)
•
Timers ........................................................... 8-bit ✕ 3, 16-bit ✕ 2
•
Serial I/O ...................................... 8-bit ✕ 1 (Clock-synchronous)
•
A-D converter .................................................. 8-bit ✕ 8 channels
(It can be used in the low-speed mode.)
•
LCD drive control circuit
Bias ............................................................................ 1/1, 1/2, 1/3
Duty ................................................................ Static, 1/2, 1/3, 1/4
Common output .......................................................................... 4
Segment output ......................................................................... 25
•
Main clock generating circuit ...................................................... 1
(connect to external ceramic resonator or built-in ring oscillator)
•
Sub clock generating circuit........................................................ 1
(connect to external quartz-crystal oscillator)
•
Power source voltage
In high-speed mode (f(XIN) ≤ 8.0 MHz) ..................... 4.0 to 5.5 V
In middle-speed mode (Mask ROM version: f(XIN) ≤ 6.0 MHz)
.................................................................................... 1.8 to 5.5 V
In middle-speed mode (One Time PROM version: f(XIN) ≤ 6.0 MHz)
.................................................................................... 2.2 to 5.5 V
In low-speed mode (Mask ROM version) .................. 1.8 to 5.5 V
In low-speed mode (One Time PROM version) ........ 2.2 to 5.5 V
•
Power dissipation (Mask ROM version)
In high-speed mode (frequency divided by 2) ........... Typ. 15 mW
(VCC = 5 V, f(XIN) = 8 MHz , Ta = 25 °C)
In low-speed mode......................................................Typ. 18 µW
(VCC = 2.5 V, f(XIN) = stop , f(XCIN) = 32 kHz , Ta = 25 °C)
•
Operating temperature range ................................... – 20 to 85°C
APPLICATIONS
Household appliances, consumer electronics, etc.
38C1 Group
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER