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H8S/2218 Scheda tecnica(PDF) 118 Page - Renesas Technology Corp

Il numero della parte H8S/2218
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  750 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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H8S/2218 Scheda tecnica(HTML) 118 Page - Renesas Technology Corp

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Section 2 CPU
Rev.6.00 Jun. 03, 2008 Page 70 of 698
REJ09B0074-0600
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
1
0
0
0
0
To change pin 14 from an output pin to an input pin, the value of bit 4 in P1DDR must be changed
from 1 to 0 (H'F0 to H'E0). Here the BCLR instruction will be used to clear bit 4 in P1DDR to 0.
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
0
0
0
0
0
Since RAM0 is a read/write area of memory, performing the above bit manipulation using the
BCLR instruction causes only bit 4 in RAM0 to be cleared to 0. The value of RAM0 is then
written 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
0
0
0
0
0
RAM0
1
1
1
0
0
0
0
0
By using the above procedure to access registers containing write-only bits, it is possible to create
programs that are not dependent on the type of instructions used.



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