CP3SP33SMSSLASHNOPB datasheet(317/407 Pages) TI1

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CP3SP33

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SNOSCW5 – MAY 2013

If the TWCFG.WDSDME bit is set, the Watchdog is serviced by writing the value 5Ch to the Watchdog

Service Data Match (WDSDM) register. This reloads the Watchdog counter with the value previously

programmed into the WDCNT register. The counter then continues counting down from that value.

A Watchdog error signal is generated by any of the following events:

•

The Watchdog serviced too late.

•

The Watchdog serviced too often.

•

The WDSDM register is written with a value other than 5Ch when WDSDM type servicing is enabled

(TWCFG.WDSDME = 1).

A Watchdog error condition resets the device.

31.3.1 Register Locking

The Timer and Watchdog Configuration (TWCFG) register is used to set the Watchdog configuration. It

controls the Watchdog clock source (T0IN or T0OUT), the type of Watchdog servicing (using WDCNT or

WDSDM), and the locking state of the TWCFG, TWCPR, TIMER0, T0CSR, and WDCNT registers. A

unpredictable results.

If the TWCFG register is itself locked, it remains locked until the device is reset. Any other locked registers

also remain locked until the device is reset. This feature prevents a run- away program from tampering

with the programmed Watchdog function.

31.3.2 Power Save Mode Operation

The Timer and Watchdog Module is active in both the Power Save and Idle modes. The clocks and

counters continue to operate normally in these modes. The WDSDM register is accessible in the Power

Save and Idle modes, but the other TWM registers are accessible only in the Active mode. Therefore,

Watchdog servicing must be carried out using the WDSDM register in the Power Save or Idle mode.

In the Halt mode, the entire device is frozen, including the Timer and Watchdog Module. On return to

Active mode, operation of the module resumes at the point at which it was stopped.

NOTE

After a restart or Watchdog service through WDCNT, do not enter Power Save mode for a

period equivalent to 5 Slow Clock cycles.

31.4 TWM Registers

The TWM registers controls the operation of the Timing and Watchdog Module. There are six such

registers:

Table 31-1. TWM Registers

NAME

ADDRESS

DESCRIPTION

TWCFG

FF A000h

Timer and Watchdog Configuration Register

TWCP

FF A004h

Timer and Watchdog Clock Prescaler Register

TWMT0

FF A008h

TWM Timer 0 Register

T0CSR

FF A00Ch

TWMT0 Control and Status Register

WDCNT

FF A010h

Watchdog Count Register

WDSDM

FF A014h

Watchdog Service Data Match Register

Timing and Watchdog Module

317

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