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H8S2245 数据表(PDF) 112 Page - Renesas Technology Corp

部件名 H8S2245
功能描述  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S2245 数据表(HTML) 112 Page - Renesas Technology Corp

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Section 2 CPU
Rev.3.00 Mar. 26, 2007 Page 70 of 772
REJ09B0355-0300
To switch P14 from being an output pin to being an input pin, we must change the value of
P1DDR bit 4 from 1 to 0 (H'F0
→ H'E0). Here, were execute a BCLR instruction for RAM0.
BCLR
#4,
@RAM0
P17
P16
P15
P14
P13
P12
P11
P10
I/O
Output
Output
Output
Output
Input
Input
Input
Input
P1DDR
1
1
1
1
0
0
0
0
RAM0
1
1
1
00
000
Since RAM0 can be read and written, when the bit manipulation instruction is executed, only bit 4
in RAM0 is cleared. Then we write this RAM0 value to P1DDR.
MOV.B
@RAM0,
R0L
MOV.B
R0L,
@P1DDR
P17
P16
P15
P14
P13
P12
P11
P10
I/O
Output
Output
Output
Input
Input
Input
Input
Input
P1DDR
1
1
1
00
000
RAM0
1
1
1
00
000
If this procedure is used to write registers that include write-only bits, programs can be written
without depending on the type of the instructions used.



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