GPL10B

© Generalplus Technology Inc.

Proprietary & Confidential

5

May 29, 2014

Version: 1.5

5. FUNCTIONAL DESCRIPTIONS

5.1. ROM

The GPL10B provides 7.5K bytes ROM size of which 7K bytes for

program and data.

The other 0.5K bytes are for GENERALPLUS

internal test use, ranged from $0200 to $1FFF.

5.2. RAM

The GPL10B provides 96 bytes RAM.

The RAM is for both stack

and data storage, ranged from $00A0 to $00FF.

5.3. Memory and I/O Map

$0000

$001F

$00A0

$00FF

$0100

$01FF

$0200

$03FF

$0400

$1FFF

GENERALPLUS TEST PROGRAM

$05FF

$0600

H/W REGISTER,I/Os

USER RAM and STACK

DUMMY for ICE DEBUG

USER'S PROGRAM DATA

AREA ROM

USER'S PROGRAM DATA

AREA ROM

5.4. Oscillators

The GPL10B is a dual clock system.

One clock is for the CPU

and system and the other is for the LCD scanning and interrupt

sources.

5.4.1. R Oscillator for the CPU and system clock

5.4.1.1. Normal case

+VDD

5.4.1.2. Noisy environment

+VDD

Note:

Length of the wiring for ROSC pin should be minimized because the

oscillator frequency varies due to coupling from other signal lines.

1). 32768Hz crystal oscillator or R oscillator (mask option) for LCD

scanning and interrupt sources (2KHz, LCDL for LCD service,

128Hz, 2Hz).

We suggest enabling 32768Hz crystal in strong

mode for a few seconds and then switch to weak mode when

reset occurs.

X32I

X32O

C1

C2

32768Hz

32768Hz Crystal

Note:

Since each crystal has its own characteristics, Generalplus

recommends users consult the crystal vendor for appropriate C1/C2 values.