Z84C2008PEG Zilog, Z84C2008PEG Datasheet - Page 35
Z84C2008PEG
Manufacturer Part Number
Z84C2008PEG
Description
IC 8MHZ Z80 CMOS PIO 40-DIP
Manufacturer
Zilog
Series
Z80r
Specifications of Z84C2008PEG
Processor Type
Z80
Features
Low Power CMOS
Speed
8MHz
Voltage
5V
Mounting Type
Through Hole
Package / Case
40-DIP (0.620", 15.75mm)
Cpu Speed
8MHz
Digital Ic Case Style
DIP
No. Of Pins
40
Supply Voltage Range
5V
Operating Temperature Range
-40°C To +100°C
Svhc
No SVHC (18-Jun-2010)
Rohs Compliant
Yes
Processor Series
Z84C2xx
Core
Z80
Data Bus Width
8 bit
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
16
Operating Supply Voltage
0 V to 5 V
Maximum Operating Temperature
+ 100 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Base Number
84
Clock Frequency
8MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
Z84C2008PEG
Manufacturer:
Zilog
Quantity:
20
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UM008005-0205
Bus Request/Acknowledge Cycle
A
D
D
15
7
7
IORQ
— D
WAIT
— D
— A
CLK
Figure 7.
Figure 8 illustrates the timing for a Bus Request/Acknowledge cycle. The
BUSREQ signal is sampled by the CPU with the rising edge of the last clock
period of any machine cycle. If the BUSREQ signal is active, the CPU sets
its address, data, and tristate control signals to the high-impedance state with
the rising edge of the next clock pulse. At that time, any external device can
control the buses to transfer data between memory and I/O devices. (This
operation is generally known as Direct Memory Access [DMA] using cycle
stealing.) The maximum time for the CPU to respond to a bus request is the
length of a machine cycle and the external controller can maintain control of
the bus for as many clock cycles as is required. If very long DMA cycles are
used, and dynamic memories are used, the external controller also performs
the refresh function. This situation only occurs if very large blocks of data
WR
RD
0
0
0
*Automatically inserted WAIT state
Input or Output Cycles
T
1
Port Address
T
2
Out
TW*
In
T
3
User’s Manual
T
Z80 CPU
1
Overview
Write
Cycle
Read
Cycle
15
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