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MEC1322 Datasheet(PDF) 314 Page - Microchip Technology

Part # MEC1322
Description  Keyboard and Embedded Controller for Notebook PC
PDF  456 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MEC1322 Datasheet(HTML) 314 Page - Microchip Technology

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MEC1322
DS00001719D-page 314
 2014 - 2015 Microchip Technology Inc.
27.10.4
HOW BIOEN BIT CONTROLS DIRECTION OF SPDOUT BUFFER
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 to determine the direction of the SPDOUT buffer when a byte is transmitted. Internally, the BIOEN
bit is sampled to control the direction of the SPDOUT buffer when the TX_DATA value is loaded into the transmit shift
register. The direction of the buffer is never changed while a byte is being transmitted.
Since the TX_DATA register may be written while a byte is being shifted out on the SPDOUT pin, the BIOEN bit does
not directly control the direction of the SPDOUT buffer. An internal DIRECTION bit, which is a latched version of the
BIOEN bit determines the direction of the SPDOUT buffer. The following list summarizes when the BIOEN bit is sam-
pled.
FIGURE 27-4:
DUAL FAST READ FLASH COMMAND
Note:
When the SPI core is used for flash commands, like the Dual Read command, the host discards the bytes
received during the command, address, and dummy byte portions of the transaction.
Rx_DATA Buffer Full (RxBF)
TX_DATA Buffer Empty (TxBE)
Write TX_Data
MCLK
BIOEN
TX_DATA
Read RX_Data
RX_DATA
Dummy Byte
BYTE 1
SPDOUT Pin
SPDIN1
SPCLKO
SPDIN2
Rx_DATA Buffer Full (RxBF)
TX_DATA Buffer Empty (TxBE)
Write TX_Data
Read RX_Data
RX_DATA
SPCLKO
SPDOUT Pin
7
6
SPDIN1
7
6
SPDIN2
Command Byte
Address [23:16]
Address Byte
[16:8]
5
4
3
2
1
0
7
6
5
4
3
2
1
0
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
7
6
5
4
3
2
1
0
1
0
7
6
5
4
3
2
7
6
5
4
3
2
1
0
1
0
7
6
5
4
3
2
1
0
Address Byte
[7:0]
BIOEN
TX_DATA
Comm
and
Address
23:16
Address
15:8
Address
7:0
MCLK
Dummy Byte
Byte 1
Byte 2
Byte 3
Byte 4
5
3
1
6
4
2
0
7
53
1
64
2
0
7
53
1
64
2
0
7
53
1
6
420
7
BYTE 2
BYTE 3
BYTE 4
6
4
2
0
6
420
6
420
6
4
20
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