learn 8085_ pin description
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Pin Description
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that the microprocessor is reset. This signal is used
to reset other devices in system.
4 SOD Serial Output Data.
This is an active high, serial output port pin, used to
transfer serial 1 bit data under software control.
5 SID Serial Input Data.
This is an active high, serial input port pin, used toaccept serial 1 bit data under software control.
6 TRAP This is a non-maskable interrupt and has highest
priority.
7 RST 7.5 Pin 7-9 are vectored interrupt that transfer the
program control to specific memory location. They
have higher priority than the INTR interrupt.
8 RST 6.5
9 RST 5.5
10 INTR Interrupt request. General purpose interrupt.
11 INTA Interrupt acknowledgement. This is used to
acknowledge interrupt.
12-19 AD0-AD7 These pins are multiplexed to be used as address bus
as well as data bus.These are signal lines which are
bidirectional & they serve dual purpose. They are
used as lower order address bus as well as data bus.
20 VSS It is ground reference.
21-28 A8-A15 These 8 signal lines are unidirectional and used for
most significant bits called higher order address bus
of a 16-bit address.
29,33 S0 These are status signal, similar to IO/M, can
identify various operations.
IO/M S1 S0 Machine Cycle
0 1 1 Opcode fetch
0 1 0 Memory read0 0 1 Memory write
1 1 0 I/O Read
1 0 1 I/O Write
1 1 1 Interrupt
Acknowledgement
30 ALE Address Latch Enable
ALE signal is used to separate AD0-AD7ie
demultiplex
ALE=1 indicates that contents are address.
ALE=0 indicates that the contents are data.
31 WR (active low) Write. This is a Write control signal (active low).
This signal indicates that the data on the data bus are
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to be written into selected memory or I/O location.
32 RD (active low) Read. This is a Read control signal (active low). This
signal indicates that the selected I/O or memory
device is to be read and data are available on data
bus.
34 IO/M This is a status signal used to differentiate between
I/O and memory location. When it is high. It indicatesan I/O operation; when it is low, it indicates a
memory operation.
35 READY If the signal at READY pin is low, the
microprocessor enters in to wait state. This signal is
primarily used to synchronize s lower peripherals with
the microprocessor.
36 RESET IN When the reset pin is activated by an external key all
the internal operations are suspended and the
program counter is cleared and the program
execution begins at zero memory address.
37 CLK OUT Clock Output.
This signal can be used as the system clock for other
devices.
38 HLDA Hold acknowledgement. This pin is used for hold
acknowledgement.
39 HOLD When HOLD pin is activated by an external signal
the microprocessor relinquishes control of buses and
allows the external pheripheral to use them.
40 VCC +5V power supply.
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