Pioneer DVR-310-S Service Manual page 89

5
RS5C372A (TUMJ ASSY : IC2271)
• Real Time Clock IC
Block Diagram
OSCIN 7
OSCOUT 6
/INTRA 5
/INTRB 1
Pin Function
No. Pin Name I/O
Interruption output B
The output of 32.768kHz (in 32768Hz crystal use), cycled interrupt for CPU, or output alarm interrupt
1 /INTRB O
(ALARM_B). This pin output 32.768kHz when activated power from 0V.
Nch open drain output.
Shift clock input
2 SCL I Synchronize with this clock, and input and output data from a SDA terminal.
Exceed VDD, and can input to 6V.
Serial input and output
3 SDA I/O Synchronize with SCL, and input and output writing data or readout data.
Exceed VDD, and can input to 6V. Nch open drain output in the output.
−
4 VSS Ground pin
Interruption output A
5 /INTRA O Cycled interrupt for CPU, or output alarm interruption (ALARM_A, ALARM_B).
This pin becomes an OFF state when activated power from 0V. N ch open drain output.
6 OSCOUT O Oscillation circuit output
7 OSCIN I Oscillation circuit input
−
8 VDD Positive supply input
5
6
Comparator_A
32kHz Output
Comparator_B
Control
Driver
OSC DIV
Correction (SEC, MIN, HOUR, WEEK, DAY, MONTH, YEAR)
OSC Address
Detect Decoder
Interrupt Control
Connect a crystal resonator of 32.768kHz or 32.000kHz between OSCIN and
OSCOUT, and constitute oscillation circuit.
(component parts of oscillation circuit except crystal resonator have it built-in.)
DVR-310-S
6
7
Alarm_A Register
(WEEK, MIN, HOUR)
Alarm_B Register
(WEEK, MIN, HOUR)
Time Counter
Address
Resister
I/O
Control
Shift Resister
Function
7
8
VDD
8
VSS
4
2 SCL
3 SDA
89
8
A
B
C
D
E
F