M80C85 Просмотр технического описания (PDF) - Oki Electric Industry
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M80C85 Datasheet PDF : 19 Pages
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¡ Semiconductor
MSM82C53-2RS/GS/JS
DESCRIPTION OF PIN FUNCTIONS
Pin Symbol
D7 - D0
CS
RD
WR
A0 - A1
CLK0 - 2
GATE0 - 2
OUT0 - 2
Name
Bidirectional
Data Bus
Chip Select
Input
Read Input
Write Input
Address Input
Clock Input
Gate Input
Counter Output
Input/Output
Input/Output
Input
Input
Input
Input
Input
Input
Output
Function
Three-state 8-bit bidirectional data bus used when writing control words
and count values, and reading count values upon reception of WR and
RD signals from CPU.
Data transfer with the CPU is enabled when this pin is at low level. When
at high level, the data bus (D0 thru D7) is switched to high impedance
state where neither writing nor reading can be executed. Internal registers,
however, remain unchanged.
Data can be transferred from MSM82C53-2 to CPU when this pin is at low
level.
Data can be transferred from CPU to MSM82C53-2 when this pin is at low
level.
One of the three internal counters or the control word register is selected
by A0/A1 combination. These two pins are normally connected to the two
lower order bits of the address bus.
Supply of three clock signals to the three counters incorporated in
MSM82C53-2.
Control of starting, interruption, and restarting of counting in the three
respective counters in accordance with the set control word contents.
Output of counter output waveform in accordance with the set mode and
count value.
SYSTEM INTERFACING
A1 A0
Address Bus
Control Bus
16 bits
Data Bus
8 bits
8 bits
A1 A0 CS D7 - 0 RD WR
MSM82C53-2
Counter #0
Counter #1
Counter #2
OUT GATE CLK
OUT GATE CLK
OUT GATE CLK
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