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18.1.3
Register Configuration
The WDT has two registers, as summarized in table 18.2. These registers control clock
selection, WDT mode switching, the reset signal, etc.
Table 18.2 WDT Registers
Address
*
1
Name
Abbrev.
R/W
Initial Value
Write
*
2
Read
Watchdog timer
control/status register
WTCSR
R/ (W)
*
3
H'00
H'FFBC
H'FFBC
Watchdog timer counter
WTCNT
R/W
H'00
H'FFBC
H'FFBD
System control register
SYSCR
R/W
H'09
H'FFE8
H'FFE8
Notes: 1. Lower 16 bits of the address.
2. For details of write operations, see section 18.2.4, Notes on Register Access.
3. Only 0 can be written in bit 7, to clear the flag.
Summary of Contents for Hitachi H8S/2191
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