GPLB30A

© Generalplus Technology Inc.

Proprietary & Confidential

7

JAN. 07, 2008

Version: 1.4

6. FUNCTIONAL DESCRIPTIONS

6.1. Memory

The GPLB30A contains 96K-byte ROM and 2752-byte SRAM.

Cooperating with Generalplus bus extender, GPBA01B, the

external memory, either RAM or ROM, can be extended up to

4MB.

Serial SRAM interface is also provided in GPLB30A, thus

SRAM space can be extended by using Generalplus Serial SRAM,

GPRS256B or GPRS512C.

6.2. Map of Memory and I/Os

*NMI SOURCE:

- LV DETECT

- TIMER1

*INT SOURCE:

- EXT INT

- TBL (2/4/8/16Hz)

- TBH (128/256/512/1KHz)

- TIMER0

- TIMER1

- UART TX

- UART RX

ROM

(Bank)H

I/O &

$0000-$003F

$3E00-$3EFF

$4000-$7FFF

$8000-$BFFF

$C000-$FFF9

$FFFA-$FFFF

CPU View

$00000-$03FFF

$04000-$07FFF

$08000-$0BFFF

$0C000-$0FFFF

$10000-$13FFF

0H

1H

1L

$14000-$17FFF

2H

2L

ROM View

Bank Address: $0

$C000-$FFFF always mapping into 0L

0

1

2

3

0L

Reg.

$0040-$0AFF

ROM

(Bank)L

Interrupt

ROM

DPRAM

RAM

0L

1. $4000-$BFFF can be external memory if MEXT ($07.7) =1 and Bank port ($00.7)=1.

2. $C000-$FFFF can be external memory if MEXT ($07.7) =1 and EXC($0b.1)=1.

3. User program should start from $C800. $C000-$C7FF is the test program area.

4. User program interrupt vector: $FFFA ~ $FFFF.

5. Test program interrupt vector: $FFF2 ~ $FFF7.

6.3. Operating States

There are three operation modes involved in GPLB30A/31A:

standby, halt and operating.

The following table shows the

differences between these modes.

Operating

Halt

Standby

CPU

ON

OFF

OFF

32768Hz oscillator

ON

ON

OFF

LCD driver

ON

ON/OFF

OFF

6.3.1. Operating mode

In operating state, all functions (CPU, 32768Hz oscillator,

timer/counter, LCD driver…) are activated.

Generally speaking,

this mode consumes the highest current.

6.3.2. Standby mode

Write “07H” to P_04H_CPU_Clk_Ctrl Register ($04) and turn off

32768Hz oscillator to activate standby mode.

The standby mode

is a mode where the device is placed in its lowest current

consumption state.

In standby mode, all functions are turned off;

in addition, RAM and I/Os will remain in their previous states.

6.3.3. Halt mode

Write “07H” to P_04H_CPU_Clk_Ctrl Register ($04) but still keeps

32768Hz oscillator running to enter halt mode.

In halt mode,

CPU clock halts and waits for an event (key press, timer overflow)

to

wake

up.

The

32768Hz

related

functions,

such

as

timer/counter and LCD driver, may remain active in the halt mode.