HT9580 datasheet(31/63 Pages) HOLTEK

31 / 63 page

HT9580

April 28, 2000

Preliminary

SPI input buffer register (read only)

Address

Name

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

State on

POR

0038H

SPI-IN3

0000 0000

0039H

SPI-IN2

0000 0000

003AH

SPI-IN1

0000 0000

003BH

SPI-IN0

0000 0000

The SPI-IN3~0 are used when receiving data on the serial bus. When SPI transmits only valid data

writes to the register SPI-OUT3~0, "START" will initiate the SPI data transmission from HT9580 to

FLEXTM decoder. After completion of the 4-byte data transfer, the "SPIFG" status bit will be set and

the internal signal "REQST" will generate a falling edge signal for NMI. The bit7 of SPI-IN3 is MSB

and bit0 of SPI-IN0 is LSB.

SP I F G

RE Q S T

(N M I )

RE Q S T

( r egi s t er )

ST AR T

( r egi s t er )

SC K

MO S I

( f r o m H T 95 80)

MI S O

( f r o m dec od er )

S S ( t o d ec oder )

SR D Y

( f r o m dec od er )

SP I - O U T 3 ~ 0

S P I- IN 3 ~ 0

LS B

MS B

S P I pac k e t e x c h ange i ni t i at ed b y t he H T 9580

HT9580 Datasheet(PDF) 31 Page - Holtek Semiconductor Inc

HT9580 Datasheet(HTML) 31 Page - Holtek Semiconductor Inc

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