Cypress CY7C67200 manual 3Wire Enable Bit

Models: CY7C67200

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3Wire Enable (Bit 15)

CY7C67200

3Wire Enable (Bit 15)

The 3Wire Enable bit indicates if the MISO and MOSI data lines are tied together allowing only half duplex operation.

1:MISO and MOSI data lines are tied together

0:Normal MISO and MOSI Full Duplex operation (not tied together)

Phase Select (Bit 14)

The Phase Select bit selects advanced or delayed SCK phase. This field only applies to master mode.

1:Advanced SCK phase

0:Delayed SCK phase

SCK Polarity Select (Bit 13)

This SCK Polarity Select bit selects the polarity of SCK.

1:Positive SCK polarity

0:Negative SCK polarity

Scale Select (Bits [12:9])

The Scale Select field provides control over the SCK frequency, based on 48 MHz. See Table 34 for a definition of this field. This field only applies to master mode.

Table 34.Scale Select Field Definition for SCK Frequency

Scale Select [12:9]

SCK Frequency

0000

12 MHz

0001

8 MHz

0010

6 MHz

0011

4 MHz

0100

3 MHz

0101

2 MHz

0110

1.5 MHz

0111

1 MHz

1000

750 KHz

1001

500 KHz

1010

375 KHz

1011

250 KHz

1100

375 KHz

1101

250 KHz

1110

375 KHz

1111

250 KHz

Master Active Enable (Bit 7)

The Master Active Enable bit is a read-only bit that indicates if the master state machine is active or idle. This field only applies to master mode.

1:Master state machine is active

0:Master state machine is idle

Master Enable (Bit 6)

The Master Enable bit sets the SPI interface to master or slave. This bit is only writable when the Master Active Enable bit reads ‘0’, otherwise value will not change.

1:Master SPI interface

0:Slave SPI interface

SS Enable (Bit 5)

The SS Enable bit enables or disables the master SS output.

1:Enable master SS output

0:Disable master SS output (three-state master SS output, for single SS line in slave mode)

SS Delay Select (Bits [4:0])

When the SS Delay Select field is set to ‘00000’ this indicates manual mode. In manual mode SS is controlled by the SS Manual bit of the SPI Control register. When the SS Delay Select field is set between ‘00001’ to ‘11111’, this value indicates the count in half bit times of auto transfer delay for:

SSLOW to SCK active, SCK inactive to SS HIGH, SS HIGH time. This field only applies to master mode.

Document #: 38-08014 Rev. *G

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Cypress CY7C67200 manual 3Wire Enable Bit