MEC1322 Datasheet, PDF (323/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
Offset ^00h
Bits
Description
Type
1 BIOEN
R/W
Bidirectional Output Enable control. When the SPI is configured for
Half Duplex mode or Dual Mode the SPDOUT pin operates as a bi-
directional signal. The BIOEN bit is used by the internal DIRECTION
bit to control the direction of the SPDOUT buffers. The direction of
the buffer is never changed while a byte is being transmitted.
1=The SPDOUT_Direction signal configures the SPDOUT signal as
an output.
0=The SPDOUT_Direction signal configures the SPDOUT signal as
an input.
See Section 27.10.4, "How BIOEN Bit Controls Direction of SPD-
OUT Buffer" for details on the use of BIOEN.
0 LSBF
R/W
Least Significant Bit First
27.12.3
1= The data is transferred in LSB-first order.
0= The data is transferred in MSB-first order. (default)
SPI STATUS REGISTER
Offset ^08h
Bits
31:3 Reserved
2 ACTIVE
Description
Type
R
R
1 RXBF
R
Receive Data Buffer Full status. When this bit is ‘1’ the Rx_Data buf-
fer is full. Reading the SPI RX_Data Register clears this bit. This sig-
nal may be used to generate a SPI_RX interrupt to the EC.
1=RX_Data buffer is full
0=RX_Data buffer is not full
0 TXBE
R
Transmit Data Buffer Empty status. When this bit is ‘1’ the Tx_Data
buffer is empty. Writing the SPI TX_Data Register clears this bit. This
signal may be used to generate a SPI_TX interrupt to the EC.
1=TX_Data buffer is empty
0=TX_Data buffer is not empty
Default
1h
Reset
Event
VCC1_R
ESET
0h
VCC1_R
ESET
Default
-
0h
0h
Reset
Event
-
VCC1_R
ESET
VCC1_R
ESET
1h
VCC1_R
ESET
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DS00001719D-page 323