HTG2190 datasheet(29/50 Pages) HOLTEK

29 / 50 page

;* use master mode

;* serial clock=F1/2

serial

equ

2Ah

;serialdatabuffer

serc

equ

29h

;serial control register

data

equ

51h

;

org

004h

jmp

serial_op

;serial

;

serialap:

;serial function testing (PA=16h)

mov

a,55h

mov

data,a

mov

serial,a

;write data to serial register

set

pbc

;set port B I/P

serail_I:

clr

pbc.5

;serial clock output

mov

a,00000111b

;SCLKX=F1/2

mov

serc,a

;latch data (h->1)

wait:

pb.2

;

jmp

wait

set

EEI

clr

serc.0

;trigger the serial interface start

ret

serial_op:

mov

a,data

;reload data to register

mov

serial,a

clr

serc.0

;enable serial

ret

HTG2190

Rev. 1.20

July 5, 2002

When the output of the 8 bits data from D0~D7 is com-

pleted, the interrupt factor flag is set to

²1² and interrupt

is generated. Moreover, the interrupt can be masked by

the interrupt mask register INTC.

Note, however, that regardless of the setting of the inter-

rupt mask register, the interrupt factor flag is set to

²1²

after output of the 8 bits data.

Serial data input

By writing

²0² to SERC.0, the serial data is input from

the SIN terminal, synchronizes with the synchronous

clock, and is sequentially read in the 8 bits shift register.

The input data will be fetched at the rising edge (.1=

²0²)

of SCLK. When the input of the 8 bits data from D0~D7

is completed, the interrupt factor flag EIF is set to

²1²

and interrupt is generated. Moreover, the interrupt can

be masked by the interrupt mask register SERDATA.

Note, however, that regardless of the setting of the inter-

rupt mask register, the interrupt factor flag is set to

²1²

after input of the 8 bits data.

HTG2190 Datasheet(PDF) 29 Page - Holtek Semiconductor Inc

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