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EM78P809N
8-Bit Microcontroller
20 •
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
URTD − UART Transmit Data Buffer ( Address: 09h )
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
URTD 7 URTD 6 URTD 5 URTD 4 URTD 3 URTD 2 URTD 1 URTD0
Bit 7 ~ Bit 0 ( URTD 7 ~ URTD 0) : UART transmit data buffer. Write only.
Register Bank 3 ( R3 bits ( 7,6) = (1,1) )
SPIC1 − SPI Control Register 1 ( Address: 05h )
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SMP DCOL BRS2 BRS1 BRS0 EDS DORD WBE
Bit 7 ( SMP ) : SPI data input sample phase.
SMP = “0” : Input data sampled at middle of data output time
SMP = “1” : Input data sampled at the end of data output time
In using external clock, data input sample is fixed at the middle of data output time.
Bit 6 ( DCOL ) : SPI Data collision.
DCOL = “0” : Data collision didn’t occur
DCOL = “1” : Data collision occurred. It should be cleared by software.
Bit 5 ~ Bit 3 ( BRS0 ~ BRS2 ) : SPI Clock Source Select
BRS2 BRS1 BRS0
Clock Source
( Normal, Idle )
Max. Transfer Rate
( Fc = 8MHz )
0 0 0 Fc/2
13
0.95Kbit/s
0 0 1 Fc/2
11
3.8Kbit/s
0 1 0 Fc/2
10
7.6Kbit/s
0 1 1 Fc/2
8
30.5Kbit/s
1 0 0 Fc/2
6
122Kbit/s
1 0 1 Fc/2
5
244Kbit/s
1 1 0 External clock (/SCK pin) -
1 1 1 External clock (/SCK pin) -
Bit 2 ( EDS ) : Data shift out edge select.
EDS = “0” : Rising edge
EDS = “1” : Falling edge
Bit 1 ( DORD ) : Data transmission order.
DORD = “0” : Shift left (MSB first)
DORD = “1” : Shift right (LSB first)