h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 401

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

14.2
The WDT has the pins listed in table 14.1.
Table 14.1 Pin Configuration
14.3
The WDT has the following registers. To prevent accidental overwriting, TCSR and TCNT have
to be written to in a method different from normal registers. For details, refer to section 14.6.1,
Notes on Register Access. For details on the system control register, refer to section 3.2.2, System
Control Register (SYSCR).
14.3.1
TCNT is an 8-bit readable/writable up-counter.
TCNT is initialized to H'00 when the TME bit in the timer control/status register (TCSR) is
cleared to 0.
Name
Reset output pin
External sub-clock input
pin
Timer counter (TCNT)
Timer control/status register (TCSR)
Register Descriptions
Timer Counter (TCNT)
Input/Output Pins
Symbol
RESO
EXCL
I/O
Output
Input
Function
Outputs the counter overflow signal in
watchdog timer mode
prescaler counter
Inputs the clock pulses to the WDT_1
Rev. 3.00 Mar 21, 2006 page 347 of 788
Section 14 Watchdog Timer (WDT)
REJ09B0300-0300