W79E201 Datasheet, PDF (14/87 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E201
Continued
BIT NAME
FUNCTION
Timer 1 clock select:
4 T1M _{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:
3 T0M _{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.
Stretch MOVX select bit 2:
These three bits are used to select the stretch value for the MOVX instruction. Using
a variable MOVX length enables the user to access slower external memory devices
2 MD2 ^{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.
Stretch MOVX select bit 1:
These three bits are used to select the stretch value for the MOVX instruction. Using
a variable MOVX length enables the user to access slower external memory devices
1 MD1 ^{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.
Stretch MOVX select bit 0:
These three bits are used to select the stretch value for the MOVX instruction. Using
a variable MOVX length enables the user to access slower external memory devices
0 MD0 ^{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.
WD1
0
0
1
1
WD0
0
1
0
1
INTERRUPT TIME-OUT
2¹⁷
2²⁰
2²³
2²⁶
RESET TIME-OUT
2¹⁷ + 512
2²⁰ + 512
2²³ + 512
2²⁶ + 512
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