w78l365a Winbond Electronics Corp America, w78l365a Datasheet - Page 17

• Manufacturer Part Number: w78l365a
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

PWM0 Register
PWMP Register
PWM4 Register
PWM Control 2 Register
5.8
The Watchdog timer is a free-running timer which can be programmed by the user to serve as a
system monitor, a time-base generator or an event timer. It is basically a set of dividers that divide the
system clock. The divider output is selectable and determines the time-out interval. When the time-out
occurs, a system reset can also be caused if it is enabled. The main use of the Watchdog timer is as a
system monitor. This is important in real-time control applications. In case of power glitches or electro-
magnetic interference, the processor may begin to execute errant code. If this is left unchecked the
entire system may crash. The watchdog time-out selection will result in different time-out values
depending on the clock speed. The Watchdog timer will de disabled on reset. In general, software
should restart the Watchdog timer to put it into a known state. The control bits that support the
Watchdog timer are discussed below.
Watchdog Timer Control Register
ENW : Enable watch-dog if set.
CLRW : Clear watch-dog timer and prescaler if set. This flag will be cleared automatically
PWM4OE: Output enable for PWM4
ENPWM: Enable for PWM4
Watchdog Timer
Bit:
Bit:
Bit:
Bit:
Bit:
ENW
7
-
7
7
7
7
Mnemonic: PWMCON2
CLRW
Mnemonic: PWM1
Mnemonic: PWM0
6
Mnemonic: PWMP
Mnemonic: PWM4
-
Mnemonic: WDTC
6
6
6
6
WIDL
5
-
5
5
5
5
4
- 17 -
-
4
4
4
4
-
Address: DBH
Address: DAH
Address: CFH
Address: D9H
Address: 8FH
3
-
3
3
3
3
Address: CEH
-
W78LE365/W78L365A
Publication Release Date: April 28, 2008
PWM4OE
2
PS2
2
2
2
2
PS1
1
-
1
1
1
1
ENWPM4
PS0
0
0
0
0
0
Revision A8