16
TTP-243 Bar Code Printer
Service Manua
l
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
the timer A2, timer A3, timer A4 I/O pins and
TimeB0 and TimeB1 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
the 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 the
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.
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