1. OVERVIEW
1.1 Description
The HMS87C1X0XA is an advanced CMOS 8-bit microcontroller with 4K/2K bytes of EPROM. The Hynix
HMS87C1X0XA is a powerful microcontroller which provide a highly flexible and cost effective solution to many small
applications such as controller for battery charger. The HMS87C1X0XA provides the following standard features: 4K/2K
bytes of EPROM, 128bytes of RAM, 8-bit timer/counter, 8-bit A/D converter, 10-bit high speed PWM output, programmable
buzzer driving port, power-on reset circuit, on-chip oscillator and clock circuitry. In addition, the HMS87C1X0XA supports
power saving modes to reduce power consumption.
This document is only explained for the base of HMS87C1304A, the other’s eliminated functions are same as below.

1.2 Features
• 4K/2K Bytes On-chip Program Memory
• 128 Bytes of On-chip Data RAM
(Included stack memory)
• Instruction Cycle Time:
- 250nS at 8MHz
• Programmable I/O pins
(LED direct driving can be source and sink)
- HMS87C1304A/1302A : 19
- HMS87C1204A/1202A : 15
- HMS87C1104A/1102A : 11
• 2.0V to 5.5V Wide Operating Range
• 8-bit A/D Converter
- 8 channels
• One 8-bit Basic Interval Timer
• Two 8-bit Timer / Counters
• One 10-bit High Speed PWM Outputs
• Watchdog timer
• Seven Interrupt sources
- External input: 2 ( 1 for HMS87C1104/2A )
- A/D Conversion: 1
- Timer: 4
• One Programmable Buzzer Driving port
( except HMS87C1104/2A )
- 500Hz ~ 130kHz

 

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