Rev. 2.0, 11/00, page 361 of 1037
17.2.3
Input Capture Register A Through D (ICRA Through ICRD)
Input capture register AH to DH (ICRAH to ICRDH)
Input capture register AL to DL (ICRAL to ICRDL)
0
3
0
R
5
0
R
7
0
9
0
R
11
0
13
0
15
R
R
R
0
R
R
1
0
2
0
R
4
0
R
6
0
8
0
R
10
0
12
0
14
ICRA, ICRB, ICRC, ICRD
ICRAH, ICRBH, ICRCH, ICRDH
ICRAL, ICRBL, ICRCL, ICRDL
R
R
R
R
0
R
0
Bit :
Initial value :
R/W :
The ICR consists of four 16-bit read only registers (ICRA through ICRD).
When the falling edge of the input capture input signal is detected, the value is transferred to the
ICRA through ICRD. At this time, the ICFA through ICFD of the TCSRX are set to 1
simultaneously. At this time, if the IDIAE through IDIDE of the TCRX are all being set to 1,
due interrupt request will be issued to the CPU. The edge of the input signal can be selected by
setting the IEDGA through IEDGD of the TCRX.
Also, the ICRC and ICRD can be used as the buffer register, respectively, of the ICRA and
ICRB by setting the BUFEA and BUFEB of the TCRX to perform buffer operations. Figure
17.2 shows the connections necessary when using the ICRC as the buffer register of the ICRA.
(BUFEA = 1)
When the ICRC is used as the buffer of the ICRA, by setting IEDGA
≠
IEDGC, both of the
rising and falling edges can be designated for use. In case of IEDGA = IEDGC, either one of the
rising edge or the falling edge only is usable. Regarding selection of the input signal edge, see
table 17.3.
Note:
Transference from the FRC to the ICR will be performed regardless of the value of the
ICF.
Содержание Hitachi H8S/2191
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