
Rev. 2.0, 11/00, page 471 of 1037
(3) Data Transfer Operations
(a) SCI1 Initialization (Asynchronous Mode)
Before transmitting and receiving data, first clear the TE and RE bits in SCR1 to 0, then
initialize the SCI1 as described below.
When the operating mode, transfer format, etc., is changed, 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 and TSR is initialized. 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 RDR1.
When an external clock is used the clock should not be stopped during operation,
including initialization, since operation is uncertain.
Figure 23.4 shows a sample SCI1 initialization flowchart.
Wait
<Initialization completed>
Start initialization
Set data transfer format
in SMR1 and SCMR1
[1]
Set CKE1 and CKE0 bits in SCR1
(TE, RE bits 0)
No
Yes
Set value in BRR1
Clear TE and RE bits in SCR1 to 0
[2]
[3]
Set TE and RE bits in SCR1 to 1,
and set RIE, TIE, TEIE,
and MPIE bits
[4]
1-bit interval elapsed?
Set the clock selection in SCR1.
Be sure to clear bits RIE, TIE, TEIE, and
MPIE, and bits TE and RE, to 0.
When the clock is selected in
asynchronous mode, it is output
immediately after SCR1 settings are made.
Set the data transfer format in SMR1 and
SCMR1.
Write a value corresponding to the bit rate
to BRR1. This is not necessary if an
external clock is used.
Wait at least one bit interval, then set the
TE bit or RE bit in SCR1 to 1. Also set the
RIE, TIE, TEIE, and MPIE bits.
Setting the TE and RE bits enables the
SO1 and SI1 pins to be used.
[1]
[2]
[3]
[4]
Figure 23.4 Sample SCI Initialization Flowchart
Содержание Hitachi H8S/2191
Страница 123: ...Rev 2 0 11 00 page 96 of 1037...
Страница 149: ...Rev 2 0 11 00 page 122 of 1037...
Страница 197: ...Rev 2 0 11 00 page 170 of 1037...
Страница 247: ...Rev 2 0 11 00 page 220 of 1037...
Страница 249: ...Rev 2 0 11 00 page 222 of 1037...
Страница 347: ...Rev 2 0 11 00 page 320 of 1037...
Страница 357: ...Rev 2 0 11 00 page 330 of 1037...
Страница 417: ...Rev 2 0 11 00 page 390 of 1037...
Страница 431: ...Rev 2 0 11 00 page 404 of 1037...
Страница 439: ...Rev 2 0 11 00 page 412 of 1037...
Страница 457: ...Rev 2 0 11 00 page 430 of 1037...
Страница 525: ...Rev 2 0 11 00 page 498 of 1037...
Страница 543: ...Rev 2 0 11 00 page 516 of 1037...
Страница 639: ...Rev 2 0 11 00 page 612 of 1037 28 1 2 Block Diagram Figure 28 1 shows a block diagram of the servo circuits...
Страница 845: ...Rev 2 0 11 00 page 818 of 1037...