Z0847006PSG Zilog, Z0847006PSG Datasheet - Page 141
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
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
Z0847006PSG
Manufacturer:
Zilog
Quantity:
22
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UM008101-0601
5.
6.
7.
Interrupts at end-of-block, for example, might occur when reading a
floppy disk. If the disk transfers 128-byte records, the DMA can be made
to interrupt at the end of each record to notify the CPU of its completion.
Then the CPU can read the destination (memory) address counter to find
the last memory location filled. See Table 12 for address-counter
contents. A service routine for continuing inputs to contiguous locations
of memory typically contains the
BYTE
interrupt. A service routine for shutting down the DMA after the record
arrives typically includes
BYTE
another device, the service routine for that other device includes an
ENABLE DMA
Interrupts on byte match (a search or transfer/search operation) can be
implemented so that any ending byte, error indicator, or other character
causes the interrupt. This procedure frees the CPU from looking for these
characters in a stream of data, increases throughput, and reduces CPU
software complexity. For example, the DMA might search for end-of-text
(EXT) characters or carriage returns in a communications environment and
interrupt the CPU only when the complete message frame has arrived. The
service routines for this would be very much like those for interrupts on
end-of-block.
Interrupts on Ready are somewhat different. First, the DMA cannot be the
bus master before the interrupt because the CPU only senses interrupts
when the CPU is the bus master (the other types of interrupts are not
•
•
•
ENABLE AFTER RETI
ENABLE DMA
RETI
, and
commands. If the DMA transfer is started by an interrupt from
instruction
ENABLE DMA
command written to the DMA’s port address.
command
commands before the CPU’s return from
DISABLE DMA
command
CONTINUE
and
,
REINITIALIZE STATUS
REINITIALIZE STATUS
< % 2 7 2 G T K R J G T C N U
Direct Memory Access
7 U G T / C P W C N
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