H8SSLASH2214 datasheet(129/936 Pages) RENESAS

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Section 2 CPU

Rev.4.00 Sep. 18, 2008 Page 69 of 872

REJ09B0189-0400

Write data to the work area

Write the work area data to the

Access the work area data

(data transfer and bit manipulation

instructions can be used)

Write the work area data to the register

that includes write-only bits

Initial value write

Modifying the value of a register

that includes write-only bits

Figure 2.22 Flowchart for Access Methods for Registers that Include Write-Only Bits

Example: To clear only P14 in the port 1 P1DDR

The P1DDR register consists of 8 write-only bits and sets the I/O direction of the port 1 pins.

Reading this register is invalid. When read, the values returned are undefined.

Here we present an example in which P14 is specified to be an input port using the BCLR

instruction. First, we write the initial value H'F0 written to P1DDR to the work area in RAM

(RAM0).

MOV.B

#H'F0,

R0L

MOV.B

R0L,

@PAM0

MOV.B

R0L,

@P1DDR

P17

P16

P15

P14

P13

P12

P11

P10

I/O

Output

Input

P1DDR

RAM0

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