em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 40

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

EM78P809N
8-Bit Microcontroller
36 •
4.8 SPI (Serial Peripheral Interface)
4.7.4 Baud Rate Generator:
The baud rate generator is comprised of a circuit that generates a clock pulse to
determine the transfer speed for transmission/reception in the UART.
The BRATE2~BRATE0 bits of the URC1 register can determine the desired baud rate.
Registers for the SPI Circuit
R_BANK Address NAME
BANK 3
BANK 3
BANK 3
BANK 0
SFR
SDO
/SS
SDI
Tsystem
0X05
0X06
0X07
0x0E
0x0E
Collision
Detector
DCOL
/SS enable
4, 16, 64, 256,1024
TC1/2
BRS2~0
SPIC1
SPIC2
ISFR1
SPID
IMR1
RBFI
Prescaler
3
Buffer Full
Set to 1
Detector
SPID7
EXIF5
EXIE5
Bit 7
SPIS
SMP
R/W
R/W
R/W
R/W
R/W
RBF
Fig. 14. SPI Block Diagram
BRS2~0
DCOL
SPID6
TCIE2
TCIF2
Bit 6
R/W
R/W
R/W
R/W
(This specification is subject to change without further notice)
--
0
3
SHIFT Register
(8 bits)
SPID5
BRS2
Bit 5
ADIE
ADIF
SPID
Tx Empty
R/W
R/W
R/W
R/W
Detector
DORD
--
0
SE
Select
Edge
Product Specification (V1.0) 07.26.2005
Clear
SPID4
BRS1
Master/Slave
Bit 4
R/W
R/W
EDS
SMP
0
--
0
--
0
--
SE
SPID3
EXIE3
Select
BRS0
EXIF3
Bit 3
Edge
2
R/W
R/W
R/W
R/W
reg
TLS0~1
--
0
EDS
SPIM1 SPIM0
SPID2
TCIE4
TCIF4
Bit 2
EDS
R/W
R/W
R/W
R/W
R/W
DORD
SPID1
Bit 1
SPIE
SPIF
R/W
R/W
R/W
R/W
R/W
SCK
SPID0
TCIE3
TCIF3
Bit 0
WBE
RBF
R/W
R/W
R/W
R
R