EM78P451SWM datasheet(12/54 Pages) EMC

12 / 54 page

EM78P451S

8-Bit Microcontroller with OTP ROM

•

Product Specification (V1.0) 06.01.2004

(This specification is subject to change without further notice)

4.1.8 RA (SPIRB: SPI Read Buffer)

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

0X0A

SPIRB/RA

SRB7

SRB6

SRB5

SRB4

SRB3

SRB2

SRB1

SRB7~SRB0 are the 8-bit data when complete transmission by SPI.

4.1.9 RB (SPIWB: SPI Write Buffer)

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0x0B

SPIWB/RB

SWB7

SWB6

SWB5

SWB4

SWB3

SWB2

SWB1

SWB0

SWB7~SWB0 are the 8-bit data that are waiting for transmission by SPI.

4.1.10 RC (SPIS: SPI Status Segister)

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0x0C

SPIS/RC

TM1IF

OD3

OD4

RBFIF

RBF

Bits 7 ~ 5

Not used.

Bit 4 (TM1IF):

0 = In timer1 mode, receiving not completed yet, and an interrupt does

not occur.

1 = In timer1 mode, receiving completed, and an interrupt occurs if

enabled.

Bit 3 (OD3): Open-Drain Control bit

0 = Open-drain disable for SDO.

1 = Open-drain enable for SDO,

Bit 2 (OD4): Open-Drain Control bit

0 = Open-drain disable for SCK.

1 = Open-drain enable for SCK,

Bit 1 (RBFIF):Read Buffer Full Interrupt Flag

0 = Receiving not completed yet; and SPIRB has not fully exchanged.

1 = Receiving completed, SPIRB is fully exchanged, and an interrupt

occurs if enabled.

Bit 0 (0RBF):Read Buffer Full flag

0 = Receiving not completed yet, and SPIRB has not fully exchanged.

1 = Receiving completed; SPIRB is fully exchanged.

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