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5-2-4. Real Time Clock (RTC)
The circuit receives clock pulses from an external 32.768 kHz crystal, which it divides into hours, minutes,
seconds, year, month, and day. A battery maintains operation when power is off. KS32C6500 can up-track 100
years, begining with 1998.
32.768 KHz
BUSY FLAG CLEAR
5-2-5. Operation Panel Control
A Synchronous/Asynchronous Receiver/Transmitter (SART) controls serial data transmission between the
main circuit and the operator panel.
5-2-6. Serial Communication Signals
The KS32C6500 has two full-duplex serial communication ports. One port is used for I-LIU communication,
and the other for OPE communication.
Samsung Electronics
1HZ
15 BIT
PRESCALER
SECONDS
BUSY
DETECT
CO=28,29,
30,or 31
5 BIT
DAYS
MONTH
DECODER
Figure 5-3 RTC Block Diagram
CPU Bus
SclkCtrlLo
SclkCtrlHi
Baud Gen (8x)
Tx/Rx Control
IRQ control
SARTCmd
Internal Register
Figure 5-4 SART Block Diagram
CO=60
CO=60
6 BIT
6 BIT
MINUTES
BUSY FLAG
CO=12
4 BIT
MONTHS
LEAP YEAR
DECODER
JUPITER - 2
SartlRQ
RxShift Reg
(SARTData)
RxBuffer
(SARTData)
TxShiftReg
Circuit Description
CO=24
5 BIT
HOURS
5 BIT
YEARS
3 STATE
DRIVER
SCLK
RXD
TXD
5-3
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