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Z80 Datasheet(PDF) 37 Page - Zilog, Inc.

Part # Z80
Description  Z80 CPU PERIPHERALS
PDF  330 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z80 Datasheet(HTML) 37 Page - Zilog, Inc.

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UM008101-0601
Counter/Timer Channels

automatic features in the interrupt control logic, one pre-programmed
interrupt vector suffices for all four channels.
Loading The Channel Control Register
To load a Channel Control Word, the CPU performs a normal I/O Write
sequence to the port address corresponding to the desired CTC channel. The
CTC input pins CS0 and CS1 are used to form a 2-bit binary address to select
one of four channels within the device. (See Table 2 on page 5.) In many
system architectures, these two input pins are connected to Address Bus lines
A0 and A1, respectively, so that the four channels in a CTC device occupy
contiguous I/O port addresses. A word written to a CTC channel is
interpreted as a channel control word, and loaded into the channel control
register (bit 0 is a logic 1). The other seven bits of this word select operating
modes and conditions as indicated in Table 2.
Table 5. 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
*TIMER mode only



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