upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 482

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Chapter 14
482
Bit position
7
Initial Value
Table 14-2
Table 14-3
Table 14-4
Address
Access
14.2 Watch Timer Registers
Bit name
Note
WTCE
(1)
The Watch Timer counters WT0 and WT1 are controlled and operated by
means of the following registers:
WTn registers overview
WTn register base addresses
WTnCTL - WTn timer control register
The 8-bit WTnCTL register controls the operation of the timer WTn.
This register can be read/written in 8-bit or 1-bit units.
<base> + 6
00
WTnCTL register contents
1.
2.
Preliminary User’s Manual U17566EE1V2UM00
Timer
WT0
WT1
Register name
Watch timer synchronized read register
Watch timer non-synchronized read register
Watch timer reload register
Watch timer control register
WTCE
H
R/W
. This register is cleared by any reset.
When WTnCTL.WTCE is 1, the counter starts after the counter's load
value has been written to the reload register WTnR. As long as WTnR is
zero, no counting is performed, and no interrupts INTWTnUV are
generated.
The first interval from counter start to the first underflow takes at least four
clock cycles more than the following intervals. For details refer to “Watch
Timer start-up“ on page 486.
7
Function
Watch timer counter enable:
0: Disable count operation (the timer stops immediately with the count value
1: Enable count operation.
0000
H
H
R
6
0
and does not operate).
R
5
0
Base address
FFFF F560
FFFF F570
R
4
0
H
H
R
3
0
Shortcut
WTnCNT0
WTnCNT1
WTnR
WTnCTL
R
2
0
Watch Timer (WT)
R
1
0
Address
<base>
<base> + 2
<base> + 4
<base> + 6
R
0
0
H
H
H