Rev. 5.00, 12/03, page 507 of 1088
(1) Data write
TDR
TSR
(shift register)
Data 1
(2) Transfer from
TDR to TSR
Data 1
Data 1
; Data remains in TDR
(3) Serial data output
Note: When the ERS flag is set, it should be cleared until transfer of the last bit (D7 in LSB-first
transmission, D0 in MSB-first transmission) of the next transfer data to be transmitted has
been
completed.
In case of normal transmission: TEND flag is set
In case of transmit error:
ERS flag is set
Steps (2) and (3) above are repeated until the TEND flag is set
I/O signal line output
Data 1
Data 1
Figure 13-5 Relation Between Transmit Operation and Internal Registers
Ds
D0
D1
D2
D3
D4
D5
D6
D7
Dp
I/O data
12.5 etu
TXI
(TEND interrupt)
Note: etu: Elementary time unit (time for transfer of 1 bit)
11.0 etu
DE
Guard
time
When GM = 1
Legend:
Ds
: Start bit
D0 to D7 : Data bits
Dp
: Parity bit
DE
: Error signal
When GM = 0
Figure 13-6 TEND Flag Generation Timing in Transmission
Содержание H8S/2318 series
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