GMS81C1404 Datasheet, PDF(54/93 Page) Hynix Semiconductor

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GMS81C1404 Datasheet, PDF (54/93 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C1404/GMS81C1408

The SPI allows 8-bits of data to be synchronously transmit-

ted and received. To accomplish communication, typically

three pins are used:

- Serial Data In

- Serial Data Out

- Serial Clock

RC5/SIN

RC6/SOUT

RC4/SCK

Additonarlly a fourth pin may be used when in a master or

a slave mode of operation:

- Serial Transfer Ready RC3/SRDYIN/SRDYOUT

The serial data transfer operation mode is decided by set-

ting the SM1 and SM0 of SPI Mode Control Register, and

the transfer clock rate is decided by setting the SCK1 and

SCK0 of SPI Mode Control Register as shown in Figure

14-1 . And the polarity of transfer clock is selected by set-

ting the POL.

The bit SRDY is used for master / slave selection. If this

bit is set to â1â and SCK[1:0] is set to â11â, the controller

is performed to slave controller. As it were, the port RC3

is served for SRDYOUT.

SIOST

SCK

(POL=1)

SCK

(POL=0)

SOUT

SIN

SPIF

(SPI Int. Req)

D4 D5

Figure 14-2 SPI Timing Diagram (without SRDY control)

SRDY