H838024R datasheet(114/697 Pages) RENESAS

114 / 697 page

Section 2 CPU

Rev. 7.00 Mar 10, 2005 page 72 of 652

REJ09B0042-0700

To avoid this problem, store a copy of the PCR3 data in a work area in memory. Perform the bit

manipulation on the data in the work area, then write this data to PCR3.

[A: Prior to executing BCLR]

MOV. B

#3F,

R0L

The PCR3 value (H'3F) is written to a work area in memory

MOV. B

R0L,

@RAM0

(RAM0) as well as to PCR3.

MOV. B

R0L,

@PCR3

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

00111111

[B: BCLR instruction executed]

BCLR

@RAM0

The BCLR instruction is executed designating the PCR3

work area (RAM0).

[C: After executing BCLR]

MOV. B

@RAM0, R0L

The work area (RAM0) value is written to PCR3.

MOV. B

R0L,

@PCR3

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

0011111

PDR3

10000000

RAM0

0011111

Table 2.12 lists the pairs of registers that share identical addresses. Table 2.13 lists the registers

that contain write-only bits.

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