Digital PSoC Blocks
September 5, 2002
Document #: 38-12010 CY Rev. ** CMS Rev. 3.20
59
9.3.6
Digital Communications Type A Block xx Control Register 0 When Used as SPI Trans-
ceiver
Digital Communications Type A 04 Control Register 0
(DCA04CR0, Address = Bank 0, 33h)
Digital Communications Type A 05 Control Register 0
(DCA05CR0, Address = Bank 0, 37h)
Digital Communications Type A Block 06 Control Register 0
(DCA06CR0, Address = Bank 0, 3Bh)
Digital Communications Type A Block 07 Control Register 0
(DCA07CR0, Address = Bank 0, 3Fh)
Table 58:
Digital Communications Type A Block xx Control Register 0...
Bit #
7
6
5
4
3
2
1
0
POR
0
0
0
0
0
0
0
0
Read/
Write
RW
R
R
R
R
RW
RW
RW
Bit Name
LSB First
Overrun
SPI Complete
TX Reg
Empty
RX Reg
Full
Clock
Phase
Clock
Polarity
Enable
Bit 7
: LSB First
0 = MSB First
1 = LSB First
Bit 6
: Overrun
0 = Indicates that no overrun has taken place
1 = Indicates the RX Data register was overwritten with a new byte before the previous one had been read
Reset when this register is read
Bit 5
: SPI Complete
0 = Indicates the byte is in process of shifting out
1 = Indicates the byte has been shifted out (reset when register is read)
Optional interrupt source for both SPI Master and SPI Slave. Reset when this register is read
Bit 4
: TX Reg Empty
0 = Indicates the TX Data register is not available to accept another byte
1 = Indicates the TX Data register is available to accept another byte
Default interrupt source for SPI Master. Reset when the TX Data Register (Data Register 1) is written.
Bit 3
: RX Reg Full
0 = Indicates the RX Data register is empty
1 = Indicates a byte has been loaded into the RX Data register
Default interrupt source for SPI Slave. Reset when the RX Data Register (Data Register 2) is read
Bit 2
: Clock Phase
0 = Data changes on leading edge and is latched on trailing edge
1 = Data is latched on leading edge and is changed on trailing edge
Bit 1
: Clock Polarity
0 = Non-inverted (clock idle state is low)
1 = Inverted (clock idle state is high)
Bit 0
: Enable
0 = Function Disabled
1 = Function Enabled
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