w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 55
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w83l950d
Manufacturer Part Number
w83l950d
Description
Peripheral Personal Computer Keyboard Controller
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83L950D.pdf
(105 pages)
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GP54/CNTR0
Direction register
(f(Xcin) in low-speed mode
Port GP54
The count can be stopped by setting a “1” to the timer X (or timer Y) count stop bit in any mode. The
corresponding interrupt request bit is set each time a timer overflows.
The count source for timer Y in the timer mode or the pulse output mode can be selected from either
f(XlN)/16 or f(XCIN) by the timer Y count source selection bit of the port control register 2 (PCTL2 ) .
Oscillator
F(Xin)
CNTR
Edge selection
bit
Pulse output mode
0
Divider
1/16
active
“1”
Pulse
Measurement
mode
Port
latch
CNTR0 active
Edge selection bit
Event
Counter
mode
width
GP54
Fig.11.1 Timer X Block Diagram
Timer X count stop bit
Timer mode
Pulse output
mode
“1”
“0”
Prescaler X latch (8)
- 46 -
Prescaler X (8)
Q
Q
Toggle flip-flop
DATA BUS
R
T
Timer X latch (8)
Timer X (8)
W83L950D
Timer Y latch write pulse
Pulse output mode
To CNTR0 interrupt
Request bit
To timer X interrupt
Request bit
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