GPC3LP170A

© Generalplus Technology Inc.

Proprietary & Confidential

5

Apr. 17, 2014

Version: 1.0

6. FUNCTIONAL DESCRIPTIONS

6.1. CPU

The microprocessor inside the GPC3LP170A is an 8-bit high

performance processor equipped with Accumulator, Program

Counter, X and Y Register, Stack pointer and Processor Status

Register (the same as the 6502 instruction structure).

The

maximum CPU speed of 8.0MHz is capable of generating clearer

speech, pleasant music as well as achieving the best

performance.

6.2. RAM Area

The total RAM size is

256-byte (including Stack), 256-byte

RAM start from address $0080 through $017F ($0100 - $017F

mapping to $0180 - $01FF).

6.3. ROM Area

The GPC3LP170A provides a 512K bytes OTP ROM.

The

memory can be defined as the program area, audio data area, or

both.

To access memory, users should program the BANK

SELECT Register; choose bank, and access address to fetch

data.

6.4. Map of Memory and I/Os

I/O &

$0000-$007F

$0840-$3FFF

$C000-$FFFF

CPU View

Bank0

ROMView

ROMaddress= $C000-$FFFF

Use Bank register to mapping address

. . .

Reg.

$0080-$00FF

ProgramROM

Bank0

RAM1

$78000 - $7BFFF

$7C000 - $7FFFF

$00000 - $03FFF

$04000 - $07FFF

$08000 - $0BFFF

$0C000 - $0FFFF

$10000 - $13FFF

$14000 - $17FFF

$0180-$01FF

$0200-$07FF

Test ROM

$081A-$081F

Normal IRQ

$0820-$0835

$0836-$083F

Normal Vector

$0800-$0819

Reserved

$4000-$7FFF

ProgramROM

Bank1

$8000-$BFFF

ProgramROM

Bank2

$0100-$017F

Same as

$80-$FF

or $0100-$017F

ProgramROM

Bank register to

assign bank

Bank1

Bank2

Bank3

Bank4

Bank5

Bank30

Bank31

Reserved

RAM2

6.5. I/O Port

There are 20 IOs (IOA[7:0], IOB[7:0] and

IOC[3:0] in the

GPC3LP170A, which are bit-controlled IOs.

They can be

programmed as input (pure input or pull-low) or output buffer. As

pull-low input, they keep a less impedance to get better noise

immunity. While pressing the key (IOs to VDD), a less or large

impedance can be selected at different condition. IOA7 can be

programmed as an IR transmitter. IOA[4:3] can be programmed

as Detect IO. IOA[2:1] can also be programmed as feedback

function with IOA2 connecting to the input of inverter and IOA1

connecting to the output of inverter. With feedback function, RC

or XTAL oscillation can be implemented.

For more flexible

application, IO wakeup and ECK as TMA clock source are also

available

when

feedback

function

enable.

Refer

the

programming guide for more detail information about feedback

function. IOA1 can be programmed as an external clock source.

IOA0 can be programmed as an external interrupt source. IOB5

and IOB4 can be programmed as a 32KHz crystal clock

generator by adding external components.

IOB[3:0] can drive

high brightness LED.

IO port configuration:

6.6. DC-DC

The GPC3LP170A can work with wide input voltage (1.0V~1.8V;

1.3V~3.6V). Inside the chip, it is implemented with high efficient

DC-DC circuits. The DC-DC circuits pump input voltage to

programmed voltage that supplies chip as working voltage.

6.7. Power Saving Mode

The GPC3LP170A includes a power saving mode (standby mode)

for those applications that require low standby current. To enter

standby mode, the Wake-up Register must be enabled and then

stop the CPU clock by writing the STOP CLOCK Register to enter

standby mode. In such mode, RAM and I/Os will remain in their

previous states until being awakened.

All 20 IOs, RTC

(8Hz/2Hz), and external interrupt (IOA0) are wake-up sources in

the GPC3LP170A.

After the GPC3LP170A is awakened, the

internal CPU will continue to execute the program.

6.8. RTC (Real Time Clock)

GPC3LP170A provides two RTC (real time clock) sources: 2Hz,

8Hz. The RTC sources can be used for time counting or system