w79e532 Winbond Electronics Corp America, w79e532 Datasheet - Page 13

• Manufacturer Part Number: w79e532
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

Clock Control
WD10: Watchdog timer mode select bits: These bits determine the time-out period for the watchdog
T2M:
T1M:
T0M:
MD20: Stretch MOVX select bits: These three bits are used to select the stretch value for the MOVX
Timer 2 clock select: When T2M is set to 1, timer 2 uses a divide by 4 clock, and when set to
0 it uses a divide by 12 clock.
Timer 1 clock select: When T1M is set to 1, timer 1 uses a divide by 4 clock, and when set to
0 it uses a divide by 12 clock.
Timer 0 clock select: When T0M is set to 1, timer 0 uses a divide by 4 clock, and when set to
0 it uses a divide by 12 clock.
timer. In all four time-out options the reset time-out is 512 clocks more than the interrupt time-
out period.
instruction. Using a variable MOVX length enables the user to access slower external
memory devices or peripherals without the need for external circuits. The RD or WR strobe
will be stretched by the selected interval. When accessing the on-chip SRAM, the MOVX
instruction is always in 2 machine cycles regardless of the stretch setting. By default, the
stretch has value of 1. If the user needs faster accessing, then a stretch value of 0 should be
selected.
Mnemonic: CKCON
MD2
0
0
0
0
1
1
1
1
Bit:
WD1
MD1
0
0
1
1
0
0
1
1
0
0
1
1
WD1
7
WD0
MD0
0
1
0
1
0
1
0
1
0
1
0
1
WD0
6
Interrupt time-out
Stretch value MOVX duration
T2M
2
2
2
2
0
1
2
3
4
5
6
7
5
17
20
23
26
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T1M
2 machine cycles
3 machine cycles (Default)
4 machine cycles
5 machine cycles
6 machine cycles
7 machine cycles
8 machine cycles
9 machine cycles
4
Publication Release Date: November 21, 2005
Reset time-out
2
2
2
2
T0M
17
20
23
26
W79E532/W79L532
3
+ 512
+ 512
+ 512
+ 512
Address: 8Eh
MD2
2
MD1
1
Revision A5
MD0
0