384
CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (
µ
PD78058FY SUBSERIES)
• Example of program releasing serial transfer status
SET1
P2.5;
<1>
SET1
PM2.5;
<2>
SET1
PM2.7;
<3>
CLR1
CSIE0;
<4>
SET1
CSIE0;
<5>
SET1
RELT;
<6>
CLR1
PM2.7;
<7>
CLR1
P2.5;
<8>
CLR1
PM2.5;
<9>
<1>
This instruction prevents the SDA0 pin from outputting a low level when the I
2
C bus mode is restored
by instruction <5>. The output of the SDA0 pin goes into a high-impedance state.
<2>
This instruction sets the P25 (/SDA0) pin in the input mode to protect the SDA0 line from adverse
influence when the port mode is set by instruction <4>. The P25 pin is set in the input mode when
instruction <2> is executed.
<3>
This instruction sets the P27 (/SCL) pin in the input mode to protect the SCL line from adverse influ-
ence when the port mode is set by instruction <4>. The P27 pin is set in the input mode when
instruction <3> is executed.
<4>
This instruction changes the mode from I
2
C bus mode to port mode.
<5>
This instruction restores the I
2
C bus mode from the port mode.
<6>
This instruction prevents the SDA0 pin from outputting a low level when instruction <8> is executed.
<7>
This instruction sets the P27 pin in the output mode because the P27 pin must be in the output mode
in the I
2
C bus mode.
<8>
This instruction clears the output latch of the P25 pin to 0 because the output latch of the P25 pin
must be set to 0 in the I
2
C bus mode.
<9>
This instruction sets the P25 pin in the output mode because the P25 pin must be in the output mode
in the I
2
C bus mode.
Remark
RELT: Bit 0 of serial bus interface control register (SBIC)
Содержание PD78056F
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