Datasheet

22.2.3 Watchdog Counter Register: High (WDOG_CNTH)
This section describes the watchdog counter registers: high (CNTH) and low (CNTL)
combined.
The watchdog counter registers CNTH:L provide access to the value of the free running
watchdog counter. Software can read the counter registers at any time.
Software cannot write directly to the watchdog counter; however, two write sequences to
these registers have special functions:
1. The refresh sequence resets the watchdog counter to 0x0000. See the "Refreshing the
Watchdog" section.
2. The unlock sequence allows the watchdog to be reconfigured without forcing a reset
(when WDOG_CS1[UPDATE] = 1). See the "Unlocking the Watchdog" section.
NOTE
All other writes to these registers are illegal and force a reset.
Address: 3030h base + 2h offset = 3032h
Bit 7 6 5 4 3 2 1 0
Read CNTHIGH
Write
Reset
0 0 0 0 0 0 0 0
WDOG_CNTH field descriptions
Field Description
7–0
CNTHIGH
High byte of the Watchdog Counter
22.2.4 Watchdog Counter Register: Low (WDOG_CNTL)
See the description of the WDOG_CNTH register.
Address: 3030h base + 3h offset = 3033h
Bit 7 6 5 4 3 2 1 0
Read CNTLOW
Write
Reset
0 0 0 0 0 0 0 0
Memory map and register definition
MC9S08PA60 Reference Manual, Rev. 1, 9/2012
580 Freescale Semiconductor, Inc.