HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 516

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Note: A loop-back test can be performed by setting both RE and TE to 1 without connecting a
14.3.3 Data Format
Figure 14-3 shows the data format of the smart card interface. In receive mode, parity is checked
once per frame. If a parity error is detected, an error signal is returned to the transmitting device to
request retransmission. In transmit mode, the error signal is sampled and the same data is
retransmitted if the error signal is low.
No parity error
Parity error
Ds:
D0 to D7:
Dp:
DE:
smart card.
Card-processing device
Ds
Ds
H8/3048 Series
Start bit
Data bits
Parity bit
Error signal
Chip
D0
D0
Figure 14-2 Smart Card Interface Connection Diagram
Figure 14-3 Smart Card Interface Data Format
D1
D1
Output from transmitting device
Output from transmitting device
TxD
RxD
SCK
Px (port)
D2
D2
0
0
0
D3
D3
D4
D4
506
D5
D5
Reset line
Clock line
Data line
V
CC
D6
D6
D7
D7
I/O
CLK
RST
Dp
Dp
Smart card
Output from
receiving device
DE