Z0847006PSG Zilog, Z0847006PSG Datasheet - Page 107
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
Manufacturer
Quantity
Price
Company:
Part Number:
Z0847006PSG
Manufacturer:
Zilog
Quantity:
22
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UM008101-0601
are allowed in which the higher priority peripheral suspends the execution
of the lower priority peripheral’s service routine.
Bus-requesting daisy-chains do not have this preemption or nesting
ability. Instead, any peripheral that is able to get the bus keeps it until task
completion.
Figure 37.
Polling for Service Requests
When the CPU cannot detect interrupts directly, it polls an external gate as
shown in Figure 38.
Polling is accomplished in the following way:
•
•
CPU
Z80
Enable the DMA’s interrupt structure with a control byte
Poll a status bit to see when an interrupt request occurs
DMA
INT
+5V
INT
Interrupt Daisy-Chain
tristate enable line, normally at tristate,
for example, connected to a chip select decoder.
IEI
Interrupting Device
Highest Priority
INT
IEO
CPU
Pending
Polling
IEI
< % 2 7 2 G T K R J G T C N U
INT
Direct Memory Access
IEO
7 U G T / C P W C N
To
Lower
Priority
Interrupting
Device
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