EM78452 datasheet(12/54 Pages) EMC

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EM78452

8-Bit Microcontroller

•

Product Specification (V1.0) 10.18.2007

(This specification is subject to change without further notice)

5.1.8 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 transmission is completed by SPI.

5.1.9 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.

5.1.10 RC (SPIS: SPI Status Register)

Address Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0x0C

SPIS/RC

DORD

TD1

TD0

TM1IF

OD3

OD4

RBF

Bit 7 (DORD): Data transmission order.

0 : Shift left (MSB first)

1 : Shift right (LSB first)

Bit 6~Bit 5: SDO Status output Delay times Options

TD1

TD0

Delay Time

8 CLK

16 CLK

24 CLK

32 CLK

Bit 4 (T1ROS): Timer 1 Read Out Buffer Select Bit

0 : Read Value from Timer 1 Preset Register

1 : Read Value from Timer 1 Counter Register

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:

not used, read as “0”

Bit 0 (RBF): Read Buffer Full flag

0 : Receiving not completed, and SPIRB has not fully exchanged.

1 : Receiving completed; SPIRB is fully exchanged.

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