Sharp UP-3301 Service Manual page 64

14-2. Drawer open/close sensor
The drawer open/close sensor signal is input into the built-in port of the
CPU. The sensor signal of an optional drawer sensor is also wired read
before inputting.
• P33=1: Any of the drawers is open.
15. RS232
Two standard RS232 channels are compatible with the ER-A7RS2.
However, while the ER-A7RS2 uses the IRQ2 terminal of the CPU for
interruption of the RS232, the UP-3301 cannot use the IRQ1 terminal
instead of it. (The IRQ2 terminal is used for IR as the SCK1 terminal.)
The standard RS232 is fixed to the logic channels 1 and 2. To the built-
in printer, logic channel 7 is assigned. Use the channels 3, 4, 5 and 6 for
the ER-A7RS2.
16. MCR
This paragraph describes MCR option (UP-E12MR2) control defined by
UP-3301 hardware architecture.
2 channels of the serial port (interchangeable with 8251) built in the
MPCA8 are used. 2 tracks of data are read simultaneously. Supports is
provided for the first and second tracks MCR of ISO. (UP-E12MR2)
16-1. CPU interface
The CPU interface for the USART (8251) and magnet card reader
(MCM-21) in the UP-3301 system is shown below.
Integrated as MPCA8
in the UP-3301 system.
CPU
MPCA7
RCVRDY1
INTMCR
ICI
INTMCR
RCVRDY2
Signal description
RCP1 TRACK 1 CLOCK PULSE
RDD1 TRACK 1 DATA SIGNAL
RCP2 TRACK 2 CLOCK PULSE
RDD2 TRACK 2 DATA SIGNAL
CLS1 TRACK 1 CARD DETECTION SIGNAL
CLS2 TRACK 2 CARD DETECTION SIGNAL
RCVRDY1 TRACK 1 DATA RECEIVING SIGNAL
RCVRDY2 TRACK 2 DATA RECEIVING SIGNAL
INTMCR INTERRUPT SIGNAL OR-SYNTHESIZED from
RCVRDY and SYNC input
2 chip select signals for the 8251 are generated inside the MPCA8. The
8251 write recovery time is as follows:
8251 x 2
RCVCLK1 RCP1
RDD1
RCVDT1
RCP2
RCVCLK2
RDD2
RCVDT2
CLS1
/DSR1
/DSR2 CLS2
RCVRDY1
RCVRDY2
CLS1,
CLS2
SYNC
UP-3301US CIRCUIT DESCRIPTION
16-2. MCR interface
The operating timing of the MCR interface signals is given below.
(1) Example of timing
CLS1/CLS2
RCP1/RCP2
RDD1/RDD2
(2) Detailed timing (relation between DATA and CLOCK PULSE)
RCP1/RCP2
"0"
RDD1/RDD2
Approx. 16µs
The "NULL" CODE is written prior to the opening code. The opening
code detection algorithm is considered because data may become cor-
rupt before and after the CARD detection signal due to a worn magnet
stripe.
17. Touch panel interface
The 8251 built in the MPCA8 is used in serial communications with the
touch panel controller.
8251 (TPZ): Located in 00FFB8h ~ 00FFBBh.
Interrupt: Signal sending interrupt is connected to the INT3.
Signal receiving interrupt is connected to the INT2.
D0~D7
A0
RD
HWR
TP7(00FFB8h~00FFBBh)
RESET
PHAI(9.83)
÷
9.83MHz 64
(153.59KHz)
INT2
1 Duplex type: Full-duplex
2 Data rate: 9600 Bps
3 Synchronizing mode: Asynchronous
4 Signal level: TTL
5 Data format: 1 Start-bit
8 Data-bit
Stop-bit
Non parity-bit
– 62 –
"1" "1"
Min. 16µs
8251 (USART)
D0~D7 TXD
TPTXD
DTR
OPEN
C/D RTS
OPEN
RD RXD
TPRXD
WR CTS
GND
CS DSR
GND
RESET TXC
CLK RXC
TPCKI
TXRDY INT3
RXRDY
TXEMPTY OPEN
SYNDET
OPEN