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Z80 датащи(PDF) 23 Page - Zilog, Inc.

номер детали Z80
подробное описание детали  Z80 CPU PERIPHERALS
PDF  330 Pages
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производитель  ZILOG [Zilog, Inc.]
домашняя страница  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z80 датащи(HTML) 23 Page - Zilog, Inc.

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UM008101-0601
Counter/Timer Channels

The Prescaler
The prescaler is an 8-bit device that is used in the TIMER mode only. The
prescaler is programmed by the CPU through the Channel Control register
to divide its input, the System clock (0), by 16 or 256. The output of the
prescaler is then fed as an input to clock the down-counter. Each time that
Table 2. Channel Control Register
765
4321
0
Interrupt
Mode
Prescaler
Value*
CLK/TRG
Section
Time
Trigger*
Time
Constant
Reset
Control or
Vector
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit Number Field
R/W Value
Description
7
Interrupt
R/W
1
0
Enable Interrupt
Disable Interrupt
6Mode
R/W
1
0
COUNTER Mode
TIMER Mode
5
Prescaler Value*
R/W
1
0
256
16
4
CLK/TRG Edge
Section
R/W
1
0
Rising Edge
Falling Edge
3
Time Trigger*
R/W
1
0
CLK/TRG Pulse Starts Timer
Automatic trigger when time constant is loaded
2
Time Constant
R/W
1
0
Time Constant Follows
No Time Constant Follows
1
Reset
R/W
1
0
Software Reset
Continue Operation
0
Control or Vector
R/W
1
0
Control
Vector
*TIMER mode only



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