HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 251

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

13.1.2 Block Diagram
Figure 13-1 is a block diagram of the watchdog timer.
13.1.3 Register Configuration
Table 13-1 lists information on the watchdog timer registers.
Table 13-1 Register Configuration
Name
Timer control/status register
Timer counter
* Software can write a 0 to clear the status flag bits, but cannot write 1.
Interrupt
signals
TCNT:
TCSR:
NMI
(Watchdog timer mode)
IRQ
(Interval timer mode)
Timer Counter
Timer Control/Status Register
0
Figure 13-1 Block Diagram of Timer Counter
Interrupt
control
Abbreviation
TCSR
TCNT
Overflow
Clock
236
R/W
R/(W)*
R/W
Clock
select
TCSR
TCNT
Initial
Value
H'18
H'00
Internal clock source
Ø/2
Ø/32
Ø/64
Ø/128
Ø/256
Ø512
Ø2048
Ø4096
ø/2
ø/32
ø/64
ø/128
ø/256
ø/512
ø/2048
ø/4096
Write
H'FFED
H'FFED
Read/
write
control
Addresses
Internal data bus
Read
H'FFEC
H'FFED