H83502 datasheet(49/386 Pages) RENESAS

49 / 386 page

Table 2-6

Bit-Manipulation Instructions (cont)

Instruction

Size*

Function

BLD

BILD

(<bit-No.> of <EAd>)

→ C

Copies a specified bit in a general register or memory to the C flag.

¬ (<bit-No.> of <EAd>)

→ C

Copies the inverse of a specified bit in a general register or memory to

the C flag.

The bit number is specified by 3-bit immediate data.

BST

BIST

→ (<bit-No.> of <EAd>)

Copies the C flag to a specified bit in a general register or memory.

¬ C

→ (<bit-No.> of <EAd>)

Copies the inverse of the C flag to a specified bit in a general register or

memory.

The bit number is specified by 3-bit immediate data.

Note:

* Size: operand size

B: Byte

Notes on Bit Manipulation Instructions: BSET, BCLR, BNOT, BST, and BIST are read-

modify-write instructions. They read a byte of data, modify one bit in the byte, then write the byte

back. Care is required when these instructions are applied to registers with write-only bits and to

the I/O port registers.

Order

Operation

Read

Read one data byte at the specified address

Modify

Modify one bit in the data byte

Write

Write the modified data byte back to the specified address

Example: BCLR is executed to clear bit 0 in the port 1 data direction register (P1DDR) under the

following conditions.

P17:

Input pin, Low

P16:

Input pin, High

P15–P10: Output pins, Low

The intended purpose of this BCLR instruction is to switch P10 from output to input.

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