H838024 datasheet(112/697 Pages) RENESAS

112 / 697 page

Section 2 CPU

Rev. 7.00 Mar 10, 2005 page 70 of 652

REJ09B0042-0700

To avoid this problem, store a copy of the PDR3 data in a work area in memory. Perform the bit

manipulation on the data in the work area, then write this data to PDR3.

[A: Prior to executing BSET]

MOV. B

#80,

R0L

The PDR3 value (H'80) is written to a work area in memory

MOV. B

R0L,

@RAM0

(RAM0) as well as to PDR3

MOV. B

R0L,

@PDR3

P37

P36

P35

P34

P33

P32

P31

P30

Input/output Input

Input

Output

Pin state

Low level High level Low level Low level Low level Low level Low level Low level

PCR3

00111111

PDR3

10000000

RAM0

10000000

[B: BSET instruction executed]

BSET

@RAM0

The BSET instruction is executed designating the PDR3

work area (RAM0).

[C: After executing BSET]

MOV. B

@RAM0, R0L

The work area (RAM0) value is written to PDR3.

MOV. B

R0L,

@PDR3

P37

P36

P35

P34

P33

P32

P31

P30

Input/output Input

Input

Output

Pin state

Low level High level Low level Low level Low level Low level Low level High level

PCR3

00111111

PDR3

1000000

RAM0

1000000

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