TTP259-ASFN datasheet(20/81 Pages) TONTEK

20 / 81 page

Preliminary

TTP259

TonTouch

2015/05/25

Page 20 of 81

Ver: 1.1

.Watch Dog Timer reset

The reset signal will generate automatically when the watch dog timer

runs overflow. If the watch dog timer is cleared regularly by users’ program,

no watch dog timer reset will occur. Unless the MCU is forced into abnormal

state, the software controlled procedure is disrupted and causing watch

dog timer overflow, then it will generate reset signal to initializes the chip

returning to normal operation.

.Low voltage reset (LVR)

The LVR function is used to monitor the supply voltage of MCU, it will

generate a reset signal (with 4 OSCL de-bounce time) to reset the

microcontroller as the VDD power falls below the default setting level VLVR.

It can also be enabled or disabled by programming LVREN bit in LVREN

LVR function. User writes $A to LVREN register, LVREN bit is clear to 0 and

disable LVR function. If user writes other value to LVREN register, it can’t

change LVREN bit.

.Burn out reset (Program sequence abnormal)

As CPU out of program area, the CPU can detect the abnormal

condition and generate a system reset request.

.ROM fail reset

As ROM fail, the CPU can detect the abnormal condition and generate

a system reset request.

RESETF[300H]: Reset source flag register [R/W], power on value [0000]

Bit3

Bit2

Bit1

Bit0

Bit Name

ROMF

BOF

LVRF

WDTF

Read/Write

R/W

WDTF: Watch dog timer overflow reset flag. (0: no active; 1: active)

LVRF: Low voltage reset flag. (0: no active; 1: active)

BOF: Burn out flag. (0: no active; 1: active)

ROMF: ROM fail flag. (0: no active; 1: active)

Note: The RESETF is only cleared by power on reset and external reset.

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