GMS81C1404/GMS81C1408
SEP. 2004 Ver 1.3
1
GMS81C1404 / GMS81C1408
CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
1. OVERVIEW
1.1 Description
The GMS81C1404 and GMS81C1408 are an advanced CMOS 8-bit microcontroller with 4K/8K bytes of ROM. The Mag-
naChip semiconductor’s GMS81C1404 and GMS81C1408 are a powerful microcontroller which provides a highly flexible
and cost effective solution to many small applications such as controller for battery charger. The GMS81C1404 and
GMS81C1408 provide the following standard features: 4K/8K bytes of ROM, 192 bytes of RAM, 8-bit timer/counter, 8-bit
A/D converter, 10-bit high speed PWM output, programmable buzzer driving port, 8-bit serial communication port, on-chip
oscillator and clock circuitry. In addition, the GMS81C1404 and GMS81C1408 supports power saving modes to reduce pow-
er consumption.
1.2 Features
• 4K/8K Bytes On-chip Program Memory
• 192 Bytes of On-chip Data RAM
(Included stack memory)
• Instruction Cycle Time:
- 250nS at 8MHz
• 23 Programmable I/O pins
(LED direct driving can be source and sink)
• 2.2V to 5.5V Wide Operating Range
• One 8-bit A/D Converter
• One 8-bit Basic Interval Timer
• Four 8-bit Timer / Counters
• Two 10-bit High Speed PWM Outputs
• Watchdog timer (can be operate with internal
RC-oscillation)
• One 8-bit Serial Peripheral Interface
• Twelve Interrupt sources
- External input: 4
- A/D Conversion: 1
- Serial Peripheral Interface: 1
- Timer: 6
• One Programmable Buzzer Driving port
- 500Hz ~ 130kHz
• Oscillator Type
- Crystal
- Ceramic Resonator
• Noise Immunity Circuit
- Power Fail Processor
• Power Down Mode
- STOP mode
- Wake-up Timer mode
Device name
ROM Size
EPROM Size
RAM Size
Operatind
Voltage
Package
GMS81C1404
4K bytes
-
192bytes
2.2 ~ 5.5V
28 SKDIP or SOP
GMS81C1408
8K bytes
-
192bytes
2.2 ~ 5.5V
28 SKDIP or SOP
GMS87C1404
-
4K bytes
192bytes
2.5 ~ 5.5V
28 SKDIP or SOP
GMS87C1408
-
8K bytes
192bytes
2.5 ~ 5.5V
28 SKDIP or SOP
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