IBM EM78P312N manual SPI Serial Peripheral Interface, Bit Microcontroller, 13 SPI Block Diagram

EM78P312N

8-Bit Microcontroller

5.8 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	DCOL	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

DCOL		RBFI	RBF		SE
		Set to 1			Clear
Collision
		Buffer Full		Tx Empty
Detector		Detector
					Detector
				SHIFT Register
				SPID			reg
				(8	bits)
SDI						SMP	TLS0~1
					DORD
							2
SDO
						Master/Slave
							EDS
		BRS2~0					Edge
							Select
		3
/SS	/SS enable		BRS2~0
				3
							SE
		Prescaler
Tsystem	4, 16, 64, 256,1024				Edge
					Select
	TC1/2					EDS		SCK

Fig. 5-13 SPI Block Diagram

The serial interface are connected to external devices via P70 (/SCK), P71 (SI), P72 (SO). The serial interface can also be used as I/O port. In the transmit mode, P71 can be used as normal I/O port and in receive mode, P72 and P71 can be used as normal I/O ports.

Product Specification (V1.0) 10.03.2006 • 31

(This specification is subject to change without further notice)