em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 24

• Manufacturer Part Number: em78p809n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

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