IBM EM78P809N 4.8 SPI (Serial Peripheral Interface)

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