H8SSLASH2224 datasheet(187/1071 Pages) RENESAS

Il numero della parte	H8S/2224

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	1071 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

Logo

187 / 1071 page

Section 2 CPU

Rev. 5.00 Aug 08, 2006 page 101 of 982

REJ09B0054-0500

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 2.14 Flowchart for Access Methods for Registers That Include Write-Only Bits

Example: To clear only bit 4 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

H8S/2224 Scheda tecnica(PDF) 187 Page - Renesas Technology Corp

H8S/2224 Scheda tecnica(HTML) 187 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL