upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 485
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upd70f3422gj-gae-qs-ax
Manufacturer Part Number
upd70f3422gj-gae-qs-ax
Description
32-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD70F3422GJ-GAE-QS-AX.pdf
(930 pages)
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Watch Timer (WT)
Figure 14-2
counter value
Reload buffer
16 - bit down
INTWTnUV
14.3.1 Timing of steady operation
14.3 Watch Timer Operation
WTnR
0000
H
D0
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
D 0
D 0
D0
D1
D1
D1
D1
D 0
D 0
D 0
Chapter 14
485
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