
Rev. 1.0, 09/02, page 333 of 568
14.6.2
SCI Initialization (Clocked Synchronous Mode)
Before transmitting and receiving data, the TE and RE bits in SCR should be cleared to 0, then the
SCI should be initialized as described in a sample flowchart in figure 14.15. When the operating
mode, or transfer format, is changed for example, the TE and RE bits must be cleared to 0 before
making the change using the following procedure. When the TE bit is cleared to 0, the TDRE flag
is set to 1. Note that clearing the RE bit to 0 does not change the contents of the RDRF, PER,
FER, and ORER flags, or the contents of RDR.
Wait
<Transfer start>
Start initialization
Set data transfer format in
SMR and SCMR
No
Yes
Set value in BRR
Clear TE and RE bits in SCR to 0
[2]
[3]
Set TE and RE bits in SCR to 1, and
set RIE, TIE, TEIE, and MPIE bits
[4]
1-bit interval elapsed?
Set CKE1 and CKE0 bits in SCR
(TE, RE bits 0)
[1]
[1] Set the clock selection in SCR. Be sure
to clear bits RIE, TIE, TEIE, and MPIE,
TE and RE, to 0.
[2] Set the data transfer format in SMR and
SCMR.
[3] Write a value corresponding to the bit
rate to BRR. Not necessary if an
external clock is used.
[4] Wait at least one bit interval, then set
the TE bit or RE bit in SCR to 1.
Also set the RIE, TIE TEIE, and MPIE
bits.
Setting the TE and RE bits enables the
TxD and RxD pins to be used.
Note:
*
In simultaneous transmit and receive operations, the TE and RE bits should both be cleared
to 0 or set to 1 simultaneously.
Figure 14.15 Sample SCI Initialization Flowchart
Содержание H8S/2627
Страница 22: ...Rev 1 0 09 02 page xx of xxxvi Index 565 ...
Страница 30: ...Rev 1 0 09 02 page xxviii of xxxiv ...
Страница 36: ...Rev 1 0 09 02 page xxxiv of xxxiv Table 23 9 Flash Memory Characteristics 561 ...
Страница 82: ...Rev 1 0 09 02 page 46 of 568 ...
Страница 88: ...Rev 1 0 09 02 page 52 of 568 ...
Страница 98: ...Rev 1 0 09 02 page 62 of 568 ...
Страница 156: ...Rev 1 0 09 02 page 120 of 568 ...
Страница 390: ...Rev 1 0 09 02 page 354 of 568 ...
Страница 480: ...Rev 1 0 09 02 page 444 of 568 ...
Страница 512: ...Rev 1 0 09 02 page 476 of 568 ...
Страница 527: ...Rev 1 0 09 02 page 491 of 568 21 8 5 Writing to MSTPCR MSTPCR should only be written to by the CPU ...
Страница 528: ...Rev 1 0 09 02 page 492 of 568 ...
Страница 580: ...Rev 1 0 09 02 page 544 of 568 ...