H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 673

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Retransfer Operations
Retransfer operations are performed by the SCI in receive mode and transmit mode as described
below.
Retransfer operation when SCI is in receive mode: Figure 14.11 illustrates the retransfer
operation when the 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 to 1.
[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
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 14.11 Retransfer Operation in SCI Receive Mode
nth transfer frame
[2]
[1]
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
Retransferred frame
Rev. 3.00 Sep 15, 2006 page 639 of 988
Section 14 Smart Card Interface
(DE)
[4]
[3]
Ds D0 D1 D2 D3 D4
Transfer
frame n+1
REJ09B0330-0300