h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 440

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 Serial Communication Interface (SCI)
With the direction convention type IC and the above sample start character, the logic 1 level
corresponds to state Z and the logic 0 level to state A, and transfer is performed in LSB-first order.
The start character data above is H'3B. For the direct convention type, clear the SDIR and SINV
bits in SCMR to 0. According to smart card regulations, clear the O/E bit in SMR to 0 to select
even parity mode.
With the inverse convention type, the logic 1 level corresponds to state A and the logic 0 level to
state Z, and transfer is performed in MSB-first order. The start character data for the above is
H'3F. For the inverse convention type, set the SDIR and SINV bits in SCMR to 1. According to
smart card regulations, even parity mode is the logic 0 level of the parity bit, and corresponds to
state Z. In this LSI, the SINV bit inverts only data bits D0 to D7. Therefore, set the O/E bit in
SMR to 1 to invert the parity bit for both transmission and reception.
13.7.3
Operation in block transfer mode is the same as that in SCI asynchronous mode, except for the
following points.
• In reception, though the parity check is performed, no error signal is output even if an error is
• In transmission, a guard time of at least 1 etu is left between the end of the parity bit and the
• In transmission, because retransmission is not performed, the TEND flag is set to 1, 11.5 etu
• As with the normal smart card interface, the ERS flag indicates the error signal status, but
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REJ09B0200-0200
detected. However, the PER bit in SSR is set to 1 and must be cleared before receiving the
parity bit of the next frame.
start of the next frame.
after transmission start.
since error signal transfer is not performed, this flag is always cleared to 0.
Block Transfer Mode
(Z)
Figure 13.24 Inverse Convention (SDIR = SINV = O/E = 1)
Ds
A
D7 D6 D5 D4 D3 D2 D1 D0 Dp
Z
Z
A
A
A
A
A
A
Z
(Z) State