Z0847006PSG Zilog, Z0847006PSG Datasheet - Page 40
Z0847006PSG
Manufacturer Part Number
Z0847006PSG
Description
IC 6MHZ Z80 NMOS DART 40-DIP
Manufacturer
Zilog
Series
Z80r
Datasheet
1.Z0847006PSG.pdf
(330 pages)
Specifications of Z0847006PSG
Processor Type
Z80
Features
Dual Channel Asynchronous Receiver/Transmitter (DART)
Speed
6MHz
Voltage
5V
Mounting Type
Through Hole
Package / Case
40-DIP (0.620", 15.75mm)
Mounting Style
Through Hole
Cpu Speed
6MHz
Digital Ic Case Style
DIP
No. Of Pins
40
Supply Voltage Range
5V
Operating Temperature Range
0°C To +70°C
Svhc
No SVHC (18-Jun-2010)
Base Number
847006
Rohs Compliant
Yes
Clock Frequency
6MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number:
Z0847006PSG
Manufacturer:
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Table 6. Time Constant Register
UM008101-0601
7
TC7
R/W
< % 2 7 2 G T K R J G T C N U
7 U G T / C P W C N
Loading The Time Constant Register
Loading The Interrupt Vector Register
6
TC6
R/W
A Time Constant Data Word is written to the Time Constant register by the
CPU. This event occurs on the I/O Write Cycle following that of the
channel control word. The Time Constant Data Word may be any integer
value in the range 1-256 (Table 6). If all eight bits in this word are zero, it is
interpreted as 256. If a Time Constant Date Word is loaded to a channel
already in operation, the down-counter continues decrementing to zero
before the new time constant is loaded.
The Z80 CTC operates with the Z80 CPU programmed for mode 2
interrupt response. When a CTC interrupt request is acknowledged, a 16-bit
pointer is formed to obtain a corresponding interrupt service routine
starting address (Figure 8). The upper eight bits of this pointer are provided
by the CPU’s I register; the lower eight bits are provided by the CTC in the
form of an interrupt vector unique to the requesting channel (Figure 8). For
further details, see “CTC Interrupt Servicing” on page 27.
The five high-order bits of the interrupt vector are written to the CTC in
advance as part of the initial programming sequence. The CPU writes to the
I/O port address corresponding to the CTC Channel 0. A 0 in bit 0 signals
the CTC to load the incoming word into the interrupt vector register. When
the interrupt vector is placed on the Z80 data bus, the interrupt control logic
of the CTC automatically supplies a binary code in bits 1 and 2 identifying
which of the four CTC channels is to be serviced.
5
TC5
R/W
4
TC4
R/W
3
TC3
R/W
2
TC2
R/W
Counter/Timer Channels
1
TC1
R/W
0
TC0
R/W
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