PC-I600
Pin
Symbol
ln/Out
Active
Function
No.
level
53 KA2
Out
Low Goes low when the Z-80 1/0 28H-2FH is written.
54 KA1
Out Low
Goes low when the Z·80 1/0 28H-2FH is read.
55
KAO
Out Low
Goes low when the Z-80 1/0 60H-6FH is accessed.
56
CKO
Out
A 217KHz <pOSoutput. This signal is supplied to the HD61203 (S) LCD driver.
This signal is issued only when bit "b4" of the Z-80 1/0 37H is at "1 ",
Bit
"b4" is at "0" at power-on, but turns to "1" in the power-on routine to activate the
LCD.
57
i'öRP
Out Low Goes low when the Z-80 reads 33H of 1/0.
This signal is used by the Z-80 to read the return data from the LU57813P.
58 C/D
Out High Goes high when the Z-80 writes 3DH of 1/0.
Data are latched at a low to high transition of C/I:i. When the signal riseswith a half
clock delay from IORa, the data bus is stable.
59 10SU Out
Low
Goes low when the Z-80 1/0 20H-27H is accessed.
This signal is used for selection of the TC8576F UART.
60
E
Out
High Goes high when the Z-80 1/0 40H-5FH is accessed.
I
This signal is used to interface with the 6800 series LSI and is connected to the
HD61202 LCD driver input.
This signal is issuedwith a half clock delay slower than 10Ra.
.
61
DMEO
Out
High LH-5803 memory select signal.
•
This signal goes high when the LH·5803 accessesthe memorv,
62-70 PAO-PA7
'V
ln/Out
Corresponds to the port PA of the LH-5810 1/0 port.
This signal is used for the key strobe signal. To restore the original state of the low-
forced strobe signal, this signal must be turned high and then set in the input mode.
The input signal is pulled up internally.
65 VSS ±OV
71
PB2
'V
In Used for the cassette tape to reproduce a signal.
Pulled up internally.
72
PB5
'V
ln/Out
Used for an input port by the PC-1600.
Input to this line is a 1/64 second pulse which is issuedfrom the LU57813P sub-
controller. Pulled up internally.
73 PB6
'V
ln/Out
Used for the key strebe signal.
Application is the same as for the PA7-PAO.
Pulled up internally.
74 PB7
"'In
Receivesthe state of theIBREAK/ONlkey sent from the subcontroller.
Pulled down internally.
75
PC6 Out
Used by the Z-80 for a beep generation.
The following circuit is internally composed in the LSI.
PB2-
pe6'-
i\...
pe6
pe7'
/
SDO-
When either the PB2,
pes', pe7',
01'
SDO gaes lovv,
pes
becomes high.
To drive the buzzer, one of signals issuesa pulse.
-22-
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