Sharp MZ-5500 Tehnical Manual page 81

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D UA QJT
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In'(
DUA
QJT
----~-----I
Fig.13-1 RP5COI access timing
Tab]e 13-2 RP5C01 pin names and functions
Pin name Pin No. Function
CS, CS 1 ,2 For interfacing with the external device which becomes
valid when CS=H, CS=L. CS is connected with the power
down detect circuit of the device power supply and CS
is connected with the microcomputer.
ADJ
3
lt has the function to adjust the seconds without
intervention of the CPU. With ADJ=H the seconds are
reset to zero when it is within 0 to 29 seconds. lf
it is within 30 to 59 seconds, the seconds are then
incremented.
AO - A3
4,5,6,7 Address pin to be connected with the address bus of
the CPU.
1m 8
1/0 control input.
Low for input from the RP5C01 to
the CPU.
GND
9
OV
WR
10
1/0 control input. Low for input from the CPU to the
RP5COl.
DO - D3 11,12,
13, 14
Bidirectional data bus. Connected with the CPU data
bus.
ALARM
15 Alarm, 16HzCK, 1HzCK pulse output. Open drain output.
OSCIN,
OSCOUT
16,~7 32.768KHz crystal oscillator connection pins.
VCC 18 +5V supply