Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 13. Watchdog Timer
Rev.2.00 Aug 27, 2008 Page 115 of 458
REJ09B0250-0200
Figure 13.3 Registers WDTR, WDTS, and CSPR
Watchdog Timer Reset Register
Symbol Address After Reset
WDTR
000Dh Indeterminate
RW
NOTES:
1.
2.
Function
When w riting 00h before w riting FFh, the watchdog timer is reset.
(1)
The default value of the w atchdog timer is set to 7FFFh w hen count source protection
mode is disabled and 0FFFh w hen count source protection mode is enabled.
(2)
b7 b0
Do not generate an interrupt betw een 00h and the FFh w ritings.
When the CSPRO bit in the CSPR register is set to 1 (count source protection mode enabled),
0FFFh is set to the w atchdog timer.
WO
Watchdog Timer Start Register
Symbol Address After Reset
WDTS
000Eh Indeterminate
RW
WO
Function
The w atchdog timer starts counting after a w rite instruction to this register.
b0b7
Count Source Protection Mode Register
Symbol Address After Reset
(1)
CSPR
001Ch 00h
Bit Symbol Bit Name Function RW
NOTES:
1.
2.
—
(b6-b0)
RW
00
Write 0 before w riting 1 to set the CSPRO bit to 1.
0 cannot be set by a program.
When w riting 0 to the CSPROINI bit in the OFS register, the value after reset is set to 10000000b.
0
Reserved bits Set to 0
b3 b2 b1 b0b7 b6 b5 b4
RW
0000
CSPRO
Count source protection mode
select bit
(2)
0 : Count source protection mode disabled
1 : Count source protection mode enabled

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English