h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 544

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 14 Smart Card Interface
14.3.3
Normal Transfer Mode: Figure 14.3 shows the normal Smart Card interface data format. In
reception in this mode, a parity check is carried out on each frame, and if an error is detected an
error signal is sent back to the transmitting end, and retransmission of the data is requested. If an
error signal is sampled during transmission, the same data is retransmitted.
The operation sequence is as follows.
[1] When the data line is not in use it is in the high-impedance state, and is fixed high with a pull-
[2] The transmitting station starts transfer of one frame of data. The data frame starts with a start
[3] With the Smart Card interface, the data line then returns to the high-impedance state. The data
Rev. 5.00 Sep 22, 2005 page 518 of 1136
REJ09B0257-0500
up resistor.
bit (Ds, low-level), followed by 8 data bits (D0 to D7) and a parity bit (Dp).
line is pulled high with a pull-up resistor.
When there is no parity error
When a parity error occurs
Legend:
Ds
D0 to D7
Dp
DE
Data Format
: Start bit
: Data bits
: Parity bit
: Error signal
Ds
Ds
Figure 14.3 Normal Smart Card Interface Data Format
D0
D0
D1
D1
D2
D2
Transmitting station output
Transmitting station output
D3
D3
D4
D4
D5
D5
D6
D6
D7
D7
Dp
Dp
Receiving station
output
DE