D17133CS datasheet(158/289 Pages) NEC

158 / 289 page

CHAPTER 13

PERIPHERAL HARDWARE

143

13.3.5 Program Example of Serial Interface

(1) Program example of data transmission/reception by 8-bit transmission/reception mode (synchronous

transmission/reception)

This program executes data transmission/reception synchronizing with fX/128. Judgment of finishing serial

data transmission/reception is executed by checking interrupt request flag.

Example

MAIN:

CALL

SIOJOB

MAIN

SIOJOB:

; Prohibits interrupt in SIOJOB

CLR1

IRQSIO

; Clears interrupt request flag of SIO

SET1

SIOEN

; Enables SIO

MOV

DBF0, #SIODATL

; Sets transmitted data

MOV

DBF1, #SIODATH

PUT

SIOSFR, DBF

INITFLG

SIOTS, NOT SIOHIZ, SIOCK1, NOT SIOCK0

; Sets serial clock to "fX/128", starts shift

; register operation, and outputs serial data

LOOP:

SKT1

IRQSIO

; Transmission/reception finish judgment

LOOP

; Waits finishing transmission/reception

GET

DBF, SIOSFR

; Reads reception data

; Permits interrupt and returns to main processing

RET

;

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