GPL11B

© Generalplus Technology Inc.

Proprietary & Confidential

10

MAR. 21, 2012

Version: 1.4

5.3.3. Halt mode

In halt mode, CPU clock halts and PLL/ROSC clock sources stops,

waits for an event (key change, timer overflow…) to wake up.

The 32768Hz relevant functions, such as timer/counter and LCD

driver, may remain active in halt mode.

5.3.4. Standby mode

The standby mode is a mode that 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.

5.4.

LCD Controller/Driver

The GPL11B contains a 360-dot LCD controller/driver that can be

configured to specified patterns via programming the LCD Control

register.

Once the configuration is completed, desired patterns

can be displayed by filling data into LCD RAM.

The LCD driver

supports 1/3 ~ 1/12 duty and 1/2 ~ 1/4 bias, and its LCD frame rate

can be adjusted by programming the Port_LCDCK_CTL($11)

register in small step between 40 Hz ~ 100 Hz.

The LCD

controller/driver can still be operating during sleep mode by

keeping the 32768Hz oscillator alive.

5.5.

Watchdog Timer (WDT)

FPL11B also features an on-chip watchdog timer (WDT) that is

designed to recover the system from abnormal operation.

If WDT

is not cleared within one second, the WDT generates a signal to

reset CPU and the WDT is recommended to be cleared every 0.5

seconds via software programming to avoid accidental reset.

Note that the WDT only works when 32768Hz clock is activated.

5.6.

Wakeup/Interrupt Control

There are eight wakeup sources: 37.9K/N, 32768/N, TMO, EXT1,

EXT2, T2Hz, KEYC, and NMI.

Interrupt sources can be used as (1) wake-up source only. (2) both

wakeup source and interrupt CPU.

5.7.

RFC Function

The RFC (Resistor to Frequency Converter) circuit contains a RC

oscillation circuit and a 16-bit timer/counter to calculate the

resistance of temperature or humidity sensor relative to reference

resistor.

The circuit is shown below.

RREF

RTH

RTEMP

IOA3

PAD

IOA4

PAD

IOA5

PAD

IOA1

PAD

SMT

16 bit Timer/Counter

8-Bit data bus

8

RFCEN

IOA3 floating control

IOA4 floating control

IOA5 floating control

C1