Datasheet

MCP2210
DS22288A-page 34  2011 Microchip Technology Inc.
3.2 Read/Write RAM Settings
The set of commands/responses described in this section relates to the manipulation of the RAM settings (volatile).
3.2.1 GET (VM) SPI TRANSFER SETTINGS
3.2.1.1 Responses
TABLE 3-33: COMMAND STRUCTURE
Byte
Index
Meaning
0 0x41 – Get (VM) SPI Transfer Settings – command code
1 0x00 – Reserved
2 0x00 – Reserved
3-63 0x00 – Reserved
TABLE 3-34: RESPONSE 1 STRUCTURE
Byte
Index
Meaning
0 0x41 – Get SPI Transfer Settings (volatile memory)
1 0x00 – Command Completed Successfully
2 Size in Bytes of the SPI Transfer Structure: 17 (in decimal) = 0x11
3 Don’t Care
4 Bit Rate (Byte 3) – 32-bit value (Byte 0, Byte 1, Byte 2, Byte 3)
Example
: Bit rate = 12,000,000 bps = 00B7 1B00
- This byte position will have a value of = 0x00
5 Bit Rate (Byte 2) – 32-bit value (Byte 0, Byte 1, Byte 2, Byte 3)
Example
: Bit rate = 12,000,000 bps = 00B7 1B00
- This byte position will have a value of = 0x1B
6 Bit Rate (Byte 1) – 32-bit value (Byte 0, Byte 1, Byte 2, Byte 3)
Example
: Bit rate = 12,000,000 bps = 00B7 1B00
- This byte position will have a value of = 0xB7
7 Bit Rate (Byte 0) – 32-bit value (Byte 0, Byte 1, Byte 2, Byte 3)
Example
: Bit rate = 12,000,000 bps = 00B7 1B00
- This byte position will have a value of = 0x00
8 Idle Chip Select Value – 16-bit value (low byte):
• MSB – – – – – – LSB
CS7 CS6 CS5 CS4 CS3 CS2 CS1 CS0
9 Idle Chip Select Value – 16-bit value (high byte):
• MSB – – – – – – LSB
x x x x x x x CS8
10 Active Chip Select Value – 16-bit value (low byte):
• MSB – – – – – – LSB
CS7 CS6 CS5 CS4 CS3 CS2 CS1 CS0
11 Active Chip Select Value – 16-bit value (high byte):
• MSB – – – – – – LSB
x x x x x x x CS8
12 Chip Select to Data Delay (quanta of 100 µs) – 16-bit value (low byte)
Example
: If we have 500 µs delay between the CS being asserted and the first byte of data, the value
will be 0x0005.
- This byte position will have a value of: 0x05