GPC3LP170A

© Generalplus Technology Inc.

Proprietary & Confidential

6

Apr. 17, 2014

Version: 1.0

awaking. Each RTC occurs, the system wakes up and users

can use this signal for time counting. In addition, GPC3LP170A

supports 32768Hz OSC in auto mode, the first one second runs

at strong mode (consumes the highest power) and then switch to

weak mode automatically to save power.

6.9. Low Voltage Reset

The GPC3LP170A has a Low Voltage Reset (LVR) function. In

general, the CPU becomes unstable and malfunctions under low

voltage condition. With the unique design of Low Voltage Reset

in GPC3LP170A, it is able to reset all functions to the initial

operational (stable) state if the power voltage drops below certain

operation voltage.

6.10. Timer/Counter

The GPC3LP170A has three 12-bit timer/counters: TMA, TMB,

and TMC respectively. In the timer mode, TMA, TMB, and TMC

are re-loadable up-counters. When timer overflows from $0FFF

to $0000, the carry (overflow) signal will make the user’s pre-set

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 in the INT ENABLE Register is enabled.

After the counter is activated, the counter value can also be

read at the same time. The read instruction will not affect the

counter value nor reset it.

6.11. Speech and Melody

In speech synthesis, the GPC3LP170A can use NMI for accurate

sampling frequency. User can store the speech data in ROM

and play it back with realistic sound quality. Several algorithms

are recommended for high fidelity and compression of sound:

PCM, ADPCM, SACMA3400 and A3400Pro.

6.12. Battery voltage detect function

The GPC3LP170A has battery voltage detect (BVD) function.

There are 4 detecting levels (shown as below) can be chosen for

1 and 2 batteries application respectively.

Refer the

programming guide for more detail information about BVD

function.

Typical detecting level

Unit

Application Condition

One-battery

0.9/1.0/1.1/1.2

V

Two-battery

1.8/2.0/2.2/2.4

V

6.13. OTP Programming Circuit for GPC3LP170A

Note1: Don’t connect any component with IOA2 and IOA3 when

programming.

Note2: Connect EPM to VDD during OTP programming cycle, and keep it

floating in normal run.

Note3: Connect VPP to Writer during OTP programming cycle, and keep it

floating in normal run.