HT9580 datasheet(30/63 Pages) HOLTEK

30 / 63 page

HT9580

April 28, 2000

Preliminary

SPI SPEED register (write only)

Address

Name

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

State on

POR

0033H

SPI-SPEED

SP7

SP6

SP5

SP4

SP3

SP2

SP1

SP0

0000 0000

The register will determine the SCK clock frequency of SPI. When SPEED register are 00H, the SCK

clock output is high. The value of the frequency divider, ranging from 1 (SPEED=01H)~255

(SPEED=FFH). If SPEED=00H, the SCK output will be disabled.

X1- c l o c k

8- bi t S P E E D C oun t e r

SP I C o n t r o l

SP I

SC K

SPI output buffer register (write only)

Address

Name

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

State on

POR

0034H

SPI-OUT3

0000 0000

0035H

SPI-OUT2

0000 0000

0036H

SPI-OUT1

0000 0000

0037H

SPI-OUT0

0000 0000

The SPI-OUT3~0 are used when transmitting data on the serial bus. Only valid data write to the reg-

ister SPI-OUT3~0 and "START" initiating will begin 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 ²REQST² will generate a falling edge signal for NMI. The bit7 of SPI-OUT3 is

MSB and bit0 of SPI-OUT0 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 )

Logi c H i gh

SC K

MO S I

( f r o m H T 95 80)

SP I - O U T 3 ~ 0

SP I - I N 3 ~ 0

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 )

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

MS B

LS B

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