upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 485

Manufacturer Part Number

upd70f3422gj-gae-qs-ax

32-bit Single-chip Microcontroller

Manufacturer

Renesas Electronics Corporation.

Watch Timer (WT)

counter value

Reload buffer

16 - bit down

14.3.1 Timing of steady operation

14.3 Watch Timer Operation

This section describes the operation of the Watch Timer counters in detail.

The contents of the reload registers WTnR can be changed at any time,

provided the corresponding counter is enabled. The contents is then copied to

the reload buffer. The counters WTn reload their start value from the buffer

upon underflow.

This is illustrated in the following figure.

Reload timing and interrupt generation

D0 and D1 are two different reload values.

Note also that there is a delay between writing to WTnR and making the data

available in the reload buffer, depending on the previous reload value and the

chosen count clock.

Preliminary User’s Manual U17566EE1V2UM00