p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 341

• Manufacturer Part Number: p2125vps20
• Description: 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, see section 14.6.1, Notes
on Register Access. For details on the system control register, see section 3.2.2, System Control
Register (SYSCR).
• Timer counter (TCNT)
• Timer control/status register (TCSR)
14.3.1
TCNT is an 8-bit readable/writable up-counter.
TCNT is initialized to H'00 when the TME bit in timer control/status register (TCSR) is cleared to
0.
Name
External sub-clock input
pin
Input/Output Pins
Register Descriptions
Timer Counter (TCNT)
Symbol
EXCL
I/O
Input
Inputs the clock pulses to the WDT_1
prescaler counter
Function
Rev. 1.00 Sep. 21, 2006 Page 303 of 658
Section 14 Watchdog Timer (WDT)
REJ09B0310-0100