R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 80

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Figure 11.2 OFS, WDC, WDTR and WDTS Registers
Watchdog timer control register
O p t i o n f u n c t i o n s e l e c t r e g i s t e r
b 7
b7
Watchdog timer reset register
1
N O T E S :
b7
Watchdog timer start register
1 . T h e O F S r e g i s t e r c a n n o t b e c h a n g e d i n a p r o g r a m . S e t u s i n g a f l a s h w r i t e r .
b7
Jan 27, 2006
b 6
b6
0
1
b 5
1 1 1 1 1
b5
0
b 4
b4
b 3
b3
b 2
b2
page 69 of 205
b 1
b1
b 0
b0
b0
B i t s y m b o l
( b 7 - b 1 )
b0
WDTON
Bit symbol
(b4-b0)
The watchdog is initialized after a write instruction to this register.
The watchdog timer value is always initialized to “7FFF
whatever value is written.
WDC7
The watchdog timer starts counting after a write instruction to this register.
S y m b o l
(b5)
(b6)
O F S
Symbol
WDC
Symbol
( 1 )
Symbol
WDTR
WDTS
W a t c h d o g t i m e r
s t a r t s e l e c t b i t
Reserved bit
Bit name
Reserved bit
Reserved bit
Prescaler select bit
High-order bit of watchdog timer
Bit name
A d d r e s s
0 F F F F
Address
0: The watchdog timer starts automatically after reset
S e t t o “ 1 ”
1: The watchdog timer is inactive after reset
000F
Address
Address
000D
000E
1 6
16
16
Function
16
Function
B e f o r e s h i p m e n t
Indeterminate
Must set to “0”
00011111
0 : Divided by 16
1 : Divided by 128
Indeterminate
Must set to “0”
After reset
After reset
After reset
Function
F F
1 6
2
Function
16
” regardless of
11. Watchdog Timer
RW
RW
RW
RW
RO
RW
WO
RW
RW
R W
WO
RW