November, 99
All Rights Reserved
16
B-443 Bar Code Printer
Service Manual
A8/D8~
A15/D15
Address
medium-order/
data high-order
I/O
When the BYTE pin is set to “ L” in memory
expansion mode or microprocessor mode and
external data bus is 16-bit width, high-order
data (D15~D8) is input or output when /E
output is “ L” and an address (A15~A8) is
output when /E output is “ H” .
If the BYTE pin is “ H” that is an external data
bus is 8-bit width, only address (A15~A8) is
output.
A16/D0~
A23/D7
Address high-
order/data low-
order
I/O
In memory expansion mode or
microprocessor mode low-order data (D7~D0)
is input or output when /E output is “ L” and an
address (A23~A16) is output when /E output
is “ H” .
R/W, /BHE
ALE, /BHE
Memory Control
signal output
Output
These are R/W, /BHE, ALE, and /BLE output
pins.
P4
0
~P4
7
I/O port P4
I/O
This port is provided 5-bit I/O. As it has an I/O
register, it is possible to perform programming
to determine whether each bit serves as an
input pin or an output pin.
P5
0
~P5
7
I/O port P5
I/O
This port is used for 8-bit I/O. It has basically
the same function as port P4. In addition, it
provides timer A2, timer A3, timer A4 with I/O
pins and TimeB0, and TimeB1 with input pins.
P6
0
~P6
7
I/O port P6
I/O
This port is used for 8-bit I/O. It has basically
the same function as port P4. In addition, pins
P60 through P63 and pins P64 through P67
are capable of functioning as a 4-bit real-time
output, respectively.
P7
0
~P7
7
I/O port P7
I/O
This port is used for 8-bit I/O. It has basically
the same function as port P4. In addition, it
provides input pins for analog inputs AN0
through AN7. Pin P77 is also used for A-D
conversion start trigger input.
P8
0
~P8
7
I/O port P8
I/O
This port is used for 8-bit I/O. It has basically
the same function as port P4. In addition, it
provides RxD, TxD, CLK, /CTS//RTS
terminals for UART 0 and UART 1.
P9
0
~P9
7
I/O port P9
I/O
This is an 8-bit I/O port. It has basically the
same function as port P4. In addition, it
provides DMA request input pin and DMA
acknowledge signal output pin.
P10
0
~P10
7
I/O port P10
I/O
This is an 8-bit I/O port. It has basically the
same function as port P4. In addition, it
provides the /INT0, /INT1, /INT2 input pins,
/TC I/O pins, and /RAS, /CAS, MA8, MA9
output pin.
Summary of Contents for B-443
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Page 63: ...November 99 All Rights Reserved 60 B 443 Bar Code Printer Service Manual...
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