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EM78P809N
8-Bit Microcontroller
Product Specification (V1.0) 07.26.2005
• 21
(This specification is subject to change without further notice)
Bit 0 ( WBE ) : Write buffer empty flag. Read only.
WBE = “0” : Write buffer empty
WBE = “1” : Not empty, set to “1” automatically when writing data to the data
buffer.
SPIC2 − SPI Control Register 2 (Address : 06h )
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SPIS 0 0 0 0 SPIM1 SPIM0 RBF
Bit 7 ( SPIS ) : SPI start shift, set the bit to “1” and shift register starts to shift. It is
cleared by hardware when shifting is finished. In transferring the
next data, it must be set to “1” again.
SPIS = “0” : Shift finish
SPIS = “1” : Shift starts
Bit 2 ~ Bit 1 ( SPIM1 ~ SPIM0) : SPI Transfer Mode Select
TC2CK1 TC2CK0 Transfer Mode
0 0 8-bit Transmit/Receive mode
0 1 8-bit Transmit mode
1 0 8-bit Receive mode
1 1 Reserved
Bit 0 ( RBF ) : Set to 1 by Buffer Full Detector, and cleared to 0 automatically when
reading data from the SPID register. RBF bit will be cleared by
hardware when enabling SPI. And RBF bit is read-only. Therefore,
reading the SPRL register is necessary to avoid data collision to
occur (DCOL).
SPID (SPI Data Buffer ( Address: 07h )
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SPID7 SPID6 SPID5 SPID4 SPID3 SPID2 SPID1 SPID0
Bit 7 ~ Bit 0 ( SPID7 ~ SPID0 ) : SPI data buffer.
PHC1 − Pull High Control Register 1 ( Address: 0Ah )
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
- - /PHE81 /PHE80 /PHE63 /PHE62 /PHE61 /PHE60
Bit 5 ~ 4 ( /PHE81 ~ /PHE80 ) : bits 1, 0 of Port 8 Pull high enable bit
/PHE8x = “0” : Enable P8x pull high
/PHE8x = “1” : Disable P8x pull high