HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 728

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 15 Smart Card Interface
Retransfer Operations (Except Block Transfer Mode): Retransfer operations are performed by
the SCI in receive mode and transmit mode as described below.
• Retransfer operation when SCI is in receive mode
[1] If an error is found when the received parity bit is checked, the PER bit in SSR is
[2] The RDRF bit in SSR is not set for a frame in which an error has occurred.
[3] If no error is found when the received parity bit is checked, the PER bit in SSR is not set.
[4] If no error is found when the received parity bit is checked, the receive operation is judged to
[5] When a normal frame is received, the pin retains the high-impedance state at the timing for
Note: * The DMAC is not supported in the H8S/2321.
Rev.6.00 Sep. 27, 2007 Page 698 of 1268
REJ09B0220-0600
Figure 15.11 illustrates the retransfer operation when the SCI is in receive mode.
automatically set to 1. If the RIE bit in SCR is enabled at this time, an ERI interrupt request is
generated. The PER bit in SSR should be kept cleared to 0 until the next parity bit is sampled.
have been completed normally, and the RDRF flag in SSR is automatically set to 1. If the RIE
bit in SCR is enabled at this time, an RXI interrupt request is generated.
If DMAC * or DTC data transfer by an RXI source is enabled, the contents of RDR can be read
automatically. When the RDR data is read by the DMAC * or DTC, the RDRF flag is
automatically cleared to 0.
error signal transmission.
RDRF
PER
Ds
D0 D1 D2 D3 D4 D5 D6 D7 Dp DE
Figure 15.11 Retransfer Operation in SCI Receive Mode
nth transfer frame
[2]
[1]
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
Retransferred frame
(DE)
[4]
[3]
Ds D0 D1 D2 D3 D4
Transfer
frame n+1