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UPD780-1 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - 8-BIT N-CHANNEL MICROPROCESSOR - NEC

भाग संख्या UPD780-1
समारोह 8-BIT N-CHANNEL MICROPROCESSOR
मैन्युफैक्चरर्स NEC 
लोगो NEC लोगो 
पूर्व दर्शन
1 Page
		
<?=UPD780-1?> डेटा पत्रक पीडीएफ

UPD780-1 pdf
,.,. PD780
PROCESSOR
SYSTEM
PROCESSOR
BUS
nIII !II~---rifLCONTROL
CONTROL
Ii IIII'j'iI!
8-BIT
DATA BUS
t
DATA BUS
CONTROL
I
BLOCK DIAGRAM
INSTRUCTION DECODE
AND
PROCESSOR CONTROL
~ INSTRUCTION
REGISTER
INTERNAL
DATA BUS
ALU
....+5V
GND
¢
ADDRESS
CONTROL
1st
ADDRESS BUS
MAIN REGISTER SET
AL TERNATE REGISTER seT
ACCUMULATOR
A
B
0
H
FLAGS
F
C
E
L
ACCUMULATOR
A'
B'
0'
H'
FLAGS
F'
C'
E'
L'
INTERRUPT VECTOA I
INDex REGISTER
INDEX REGISTER
STACK POINTER
PROGRAM COUNTER
MEMORY REFRESH R
IX
IV
SP
PC
SPECIAL PURPOSE REGISTERS
NO.
1-5,
30-40
PIN
SYMBOL
AO-A15
7-10, DO-D7
12-15
27 Ml
19 MREO
20 10RO
21 RD
NAME
Address Bus
Data Bus
Machine Cycle
One
Memory Request
Input/Output
Request
Memory Read
FUNCTION
3-State Output, active high. Pins AO-A15 constitute a
16-bit address bus, which provides the address for
memory and I/O device data exchanges. Memory
capacity 65,536 bytes. AO-A7 is also needed as
refresh cycle.
3-State input/output, active high. Pins 00-07 compose
an 8-bit, bidirectional data bus, used for data exchanges
with memory and I/O devices.
Output, active low. Ml indicates that the machine cycle
in operation is the op code fetch cycle of an instruction
execution.
3-State output, active low. MREO indicates that a valid
address for a memory read or write operation is held in
the address.
3-State output, active low. The I/O request
signal indicates that the lower half of the address bus
holds a valid address for an I/O read or write operation.
The iORQ signal is also used to acknowledge an
interrupt command, indicating that an interrupt
response vector can be placed on the data bus.
3-State output, active low. R0 indicates that the
processor is requesting data from memory or an
I/O device. The memory or I/O device being addressed
should use this signal to gate data onto the data bus.
PIN. IDENTIFICATION
368

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डाउनलोड[ UPD780-1 Datasheet.PDF ]


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