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5.1.2
Block Diagram
Figure 5.1 shows a block diagram of the WDT.
CLK/32
UDF interrupt
Interrupt
control
Reset control
EWE interrupt
Internal reset
CLK/64
CLK/128
CLK/256
Selector
TCSR
TCNT
TCWA
Internal data bus (upper eight bits)
ECR controller
TCNT: Timer counter
TCSR: Timer control/status register
TCWA: Timer control write address
Figure 5.1 WDT Block Diagram
5.1.3
Register Configuration
Table 5.1 lists the WDT registers.
Table 5.1
WDT Registers
Name
Abbr.
R/W
Initial Value
Address
Timer counter write address
TCWA
R/W
H'FF
H'FFF5
Timer control/status register
TCSR
R/W *
H'2C
H'FFFC
Timer counter
TCNT
R/W
H'FF
H'FFFD
Note:
Only 1 can be written to bit 6 to set the flag.