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MCP2221 数据表(PDF) 29 Page - Microchip Technology

部件名 MCP2221
功能描述  USB 2.0 to I2C??UART Protocol Converter with GPIO
PDF  80 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP2221 数据表(HTML) 29 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS20005292B-page 29
MCP2221
TABLE 3-6:
RESPONSE STRUCTURE – READ GP SETTINGS SUB-COMMAND
Byte
Index
Function Description
Value
Effect
0
0xB0
Read Flash Data – command code echo
1
0x00
Command completed successfully
2
Structure length
3
Don’t
care
4
GP0 Power-Up Settings
Bit 7-5:
Don’t
care
Bit 4: GPIO Output value
When GP0 is set as an output GPIO, this value will be
present at the GP0 pin at Power-Up/Reset.
Bit 3: GPIO Direction
(Input/Output) – Works only when
GP0 is set for GPIO operation
1
GPIO Input mode
0
GPIO Output mode
Bit 2-0: GP0 Designation
111-011 Don’t care
010
Alternate function 0 (LED UART RX)
001
Dedicated function operation (SSPND)
000
GPIO operation
5
GP1 Power-Up Settings
Bits7-5:
Don’t
care
Bit 4: GPIO Output value
When GP1 is set as an output GPIO, this value will be
present at the GP1 pin at Power-Up/Reset.
Bit 3: GPIO Direction
(Input/Output) – Works only when
GP0 is set for GPIO operation
1
GPIO Input mode
0
GPIO Output mode
Bit 2-0: GP1 Designation
111-101 Don’t care
001
Dedicated function operation (Clock Output)
100
Alternate function 2 (Interrupt Detection)
011
Alternate function 1 (LED UART TX)
010
Alternate function 0 (ADC1)
000
GPIO operation
6
GP2 Power-Up Settings
Bits7-5:
Don’t
care
Bit 4: GPIO Output value
When GP2 is set as an output GPIO, this value will be
present at the GP2 pin at Power-Up/Reset.
Bit 3: GPIO Direction
(Input/Output) – Works only when
GP2 is set for GPIO operation
1
GPIO Input mode
0
GPIO Output mode
Bit 2-0: GP1 Designation
111-100 Don’t care
011
Alternate function 1 (DAC1)
010
Alternate function 0 (ADC2)
001
Dedicated function operation (USB)
000
GPIO operation



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