EM78P569 データシートの表示（PDF） - ELAN Microelectronics

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EM78P569

8-BIT OTP MICRO-CONTROLLER

ELAN Microelectronics 

EM78P569

8-bit OTP Micro-controller

SPIE

Read

R5 page2

RBF RBFI

set to 1

SPIR reg.

Buffer Full Detector

Write

R5 page2

SPIWC

SPIW reg.

S D I/ P 7 4

MUX

SDI

PORT74

SPIS reg.

shift right

bit 0

bit 7

SDO/P75

MUX

SDO

PORT75

SPIC reg. (R4 page1)

SPIE

0

3

SBR0 ~SBR2

Tsco

Prescaler

4, 8, 16, 32, 64, 128

16.38kHz

SBR2~SBR0

2

3

Clock Select

Edge

Select

SCK

Edge

Select

N o ise

Filter

SCK

PORT76

MUX

SPIE

SCK/P76

Fig.5 SPI structure

SPIC reg. : SPI control register

SDO: Serial data out

SDI: Serial data in

SCK: Serial clock

RBF : Set by buffer full detector, and reset in software.

RBFI : Interrupt flag. Set by buffer full detector, and reset in software.

Buffer Full Detector : Sets to 1, while an 8-bit shifting is complete.

SE : Loads the data in SPIW register, and begin to shift

SPIE : SPI control register

SPIS reg. : Shifting byte out and in.

The MSB will be shifted first. Both the SPIS register and the SPIW register are loaded at the same time.

Once data being written to, SPIS starts transmission / reception. The received data will be moved to the

SPIR register, as the shifting of the 8-bit data is complete. The RBF (Read Buffer Full ) flag and the

RBFI(Read Buffer Full Interrupt) flag are set.

SPIR reg. : Read buffer.

The buffer will be updated as the 8-bit shifting is complete. The data must be read before the next

reception is finished. The RBF flag is cleared as the SPIR register read.

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* This specification is subject to be changed without notice.

13

8/19/2004 V4.4

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