SAF-C164SM Infineon Technologies, SAF-C164SM Datasheet - Page 252

• Manufacturer Part Number: SAF-C164SM
• Description: 16-Bit CMOS Microcontroller
• Manufacturer: Infineon Technologies

WDTCON
WDT Control Register
Bit
WDTIN
WDTR
SWR
SHWR
LHWR
WDTPRE
WDTREL
Note: The reset value depends on the reset source (see description below).
The time period for an overflow of the watchdog timer is programmable in two ways:
• Input frequency to the watchdog timer can be selected via a prescaler controlled by
• Reload value WDTREL for the high byte of WDT can be programmed in register
The period P
therefore be determined by the following formula:
User’s Manual
P
15
WDT
bits WDTPRE and WDTIN in register WDTCON to be
f
WDTCON.
CPU
The execution of EINIT clears the reset indication flags.
=
14
/ 2,
2
(1 + <WDTPRE> + <WDTIN>
f
CPU
13
WDT
Function
Watchdog Timer Input Frequency Select
Controls the input clock prescaler. See
Watchdog Timer Reset Indication Flag
Cleared by a hardware reset or by the SRVWDT instruction.
Software Reset Indication Flag
Short Hardware Reset Indication Flag
Long Hardware Reset Indication Flag
Watchdog Timer Input Prescaler Control
Controls the input clock prescaler. See
Watchdog Timer Reload Value (for the high byte of WDT)
/ 4,
WDTREL
12
between servicing the watchdog timer and the next overflow can
f
CPU
-
11
/ 128, or
10
SFR (FFAE
f
9
f
CPU
CPU
6)
/ 256.
8
(2
13-4
16
WDT
PRE
rw
- <WDTREL>
7
H
/D7
H
6
-
-
)
Table
Table
5
-
-
LHW
13-1.
13-1.
2
rh
R
Watchdog Timer (WDT)
4
8
)
SHW
Reset Value: 00XX
C164CM/C164SM
rh
R
3
SW
rh
R
2
Derivatives
V1.0, 2002-02
WDT
rh
R
1
WDT
rw
IN
0
H