GMS77C1000/GMS77C1001

July. 2001 Ver. 1.1

1

GMS77C1000 / GMS77C1001

CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

1. OVERVIEW

1.1 Description

The GMS77C1000 and GMS77C1001 are an advanced CMOS 8-bit microcontroller with 0.5K/1K words(12-bit) of

EPROM. The Hynix Semiconductor GMS77C1000 and GMS77C1001 are a powerful microcontroller which provides a high

flexibility and cost effective solution to many small applications. The GMS77C1000 and GMS77C1001 provide the follow-

ing standard features: 0.5K/1K words of EPROM, 25 bytes of RAM, 8-bit timer/counter, power-on reset, on-chip oscillator

and clock circuitry. In addition, the GMS77C1000 and GMS77C1001 supports power saving modes to reduce power con-

sumption.

1.2 Features

• High-Performance RISC CPU:

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12-bit wide instructions and 8-bit wide data path

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33 single word instructions

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0.5K/1K words on-chip program memory

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25 bytes on-chip data memory

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Minimum instruction execution time

200ns @20MHz

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Operating speed: DC - 20 MHz clock input

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Seven special function hardware registers

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Two-level hardware stack

• Peripheral Features:

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Twelve programmable I/O lines

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One 8-bit timer/counter with 8-bit programmable

prescaler

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Power-On Reset (POR)

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Power Fail Detector : noise immunity circuit

2 level detect ( 3V, 2.5V )

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Internal Reset Timer (IRT)

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Watchdog Timer (WDT) with on-chip RC oscilla-

tor

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Programmable code-protection

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Power saving SLEEP mode

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Selectable oscillator options: Configuration word

RC: Low-cost RC oscillator (200KHz~4MHz)

XT: Standard crystal/resonator (455KHz~4MHz)

HF: High-speed crystal/resonator (4~20MHz)

LF: Power saving, low-frequency crystal/resonator

(32~200KHz)

• CMOS Technology:

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Low-power, high-speed CMOS EPROM technol-

ogy

-

Fully static design

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Wide-operating range:

2.5V to 5.5V @ RC, XT, LF

4.5V to 5.5V @ HF

Device name

ROM Size

RAM Size

Package

GMS77C1000

0.5K words(12-bit)

25 bytes

18 PDIP, SOP or 20 SSOP

GMS77C1001

1K words(12-bit)

25 bytes

18 PDIP, SOP or 20 SSOP