GPCL A1/B1 Series

© Generalplus Technology Inc.

Proprietary & Confidential

8

Sep. 15, 2015

Version: 1.0

7.6. IO Port Configuration

Register

Control

logic

Pin pad

Buffer(R)

Data(R)

Port_Data(W)

Port_Buffer(W)

Port_DIR(R/W)

Input/Output IOC port : IOC3 - IOC0

Register

Control

logic

pull low

Pin pad

Buffer(R)

Data(R)

Port_Data(W)

Port_Buffer(W)

Port_DIR(R/W)

Input/Output IOD port : IOD7 - IOD0

7.7. DC-DC

GPCL A1/B1 series can work wide input voltage (1.0V~1.7V;

1.3V~3.6V).

Inside the chip, it is implemented a high efficient

DC-DC circuit.

The DC-DC circuit pumps input voltage to

programmed voltage that supplies chip as working voltage.

7.8. Power Saving Mode

The GPCL A1/B1 series includes a power saving mode (Standby

mode) for those applications that require very 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 retain at the previous states until awakened.

Port IOD7-0 is

the only wake-up source in the GPCL A1/B1 series.

After GPCL

A1/B1 series wakes up, the internal CPU will stay at RESET state

for a period (Tw) and then continue to execute program.

Wakeup

Reset will neither affect RAM, nor I/Os.

T1

Tw

Wake-up

CPU CLK

SLEEP

RESET

7.9. Timer/Counter

The GPCL A1/B1 series has two 8-bit timer/counters, TMA and

TMB respectively.

TMA can be specified as a timer, but TMB can

be used as a timer or a counter.

In the timer mode, TMA and

TMB are re-loaded up-counters.

When timer rolls over from $FF

to $00,

the carry (overflow) signal will make the user’s preset

value to be loaded into timer automatically and count up again.

At the same time, the carry signal will generate an INT signal if the

corresponding bit is enabled in the INT ENABLE Register.

Suppose TMB is specified as a counter, it can be reset by loading

#00 into the counter.

After the counter has been activated, the

value in the counter can also be read at the same time.

The read

instruction will neither affect the value of the counter nor reset it.

Clock source of Timer/Counter can be selected as follows:

Timer/Counter

Clock Source

TMA

8-BIT TIMER

CPU CLOCK (T) or T/8, T/64, TMB overflow

TMB

8-BIT TIMER

T, T/65536, EXTCLK, 0, 1