521
(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 14-5 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)
11.0 etu
DE
Guard
time
When GM = 1
Legend
Ds
: Start bit
D0 to D7 : Data bits
Dp
: Parity bit
DE
: Error signal
Note : etu : Elementary time unit (time for fransfer of 1 bit)
When GM = 0
Figure 14-6 TEND Flag Generation Timing in Transmission Operation
Summary of Contents for H8S/2645
Page 4: ......
Page 16: ......
Page 58: ...26 ...
Page 110: ...78 ...
Page 120: ...88 ...
Page 132: ...100 ...
Page 160: ...128 ...
Page 172: ...140 ...
Page 418: ...386 ...
Page 444: ...412 ...
Page 530: ...498 ...
Page 562: ...530 ...
Page 642: ...610 ...
Page 662: ...630 ...
Page 688: ...656 ...
Page 756: ...724 ...
Page 784: ...752 ...
Page 812: ...780 ...
Page 837: ...805 A 2 Instruction Codes Table A 2 shows the instruction codes ...
Page 1152: ...1120 ...