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MSM80C31F Datasheet, PDF (1/39 Pages) OKI electronic componets – CMOS 8-Bit Microcontroller
E2E1037-19-41
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MSM80C31F/MSM80C51F
CMOS 8-Bit Microcontroller
GENERAL DESCRIPTION
The OKI MSM80C31F/MSM80C51F microcontroller is a low-power, 8-bit device implemented
in OKI's silicon-gate complementary metal-oxide semiconductor process technology. The
device includes 4K bytes of mask programmable ROM (MSM80C51F only), 128 bytes of
data RAM, 32 I/O lines, two 16-bit timer/counters, a five-source two-level interrupt
structure, a full duplex serial port, and an oscillator and clock circuitry. In addition, the device
has two software selectable modes for further power reduction — Idle and Power Down. Idle
mode freezes the CPU's in-struction execution while maintaining RAM and allowing the timers,
serial port and interrupt system to continue functions. Power Down mode saves the RAM
contents but freezes the oscillator causing all other device functions to be inoperative.
FEATURES
• Low power consumption by 2 mm silicon gate CMOS process technology
• Fully static circuit
• Internal program memory
: 4K bytes (MSM80C51F)
• External program memory space
: 64K bytes
• Internal data memory (RAM)
: 128 bytes
• External data memory (RAM) space
: 64K bytes
• I/O ports
: 8-bit ¥ 4 ports
• Two 16-bit timer/counters
• Multifunctional serial port (UART)
• Five interrupt sources (Priority can be set)
• Four sets of working registers (R0-7 ¥ 4)
• Stack
: Internal data memory (RAM)
128-byte area can be used arbitrarily (by SP specified)
• Two CPU power-down modes
(1) Idle mode
: CPU stopped while oscillation continued.
(Software setting)
(2) PD mode
: CPU and oscillation all stopped.
(Software setting)
(Setting I/O ports to floating status possible)
• Operating temperature
• 2-byte 1-machine cycle instructions
: –40 to +85°C (@ 12 MHz, VCC = 5 V ±20%)
–20 to +70°C (@ 16 MHz, VCC = 5 V ±5%)
: 1 msec. @ 12 MHz
0.75 msec. @ 16 MHz
• Multiplication/division instructions
: 4 msec. @ 12 MHz
3 msec. @ 16 MHz
• Instruction code addressing method
Byte specification
: Data addressing (direct)
Bit specification
: Bit addressing
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