XR21B1421 Datasheet, PDF (44/50 Pages) Exar Corporation – Enhanced 1-Ch Full-Speed

Table 25: RI Pin Bit Positions
Bit
Description
7 PULL_U
0: disable pull-up resistor
1: enable pull-up resistor
6 PULL_D
0: disable pull-down resistor
1: enable pull-down resistor if pull-up is not enabled as well
5 RMTWK
0: disable remote wakeup capability for RI pin
1: enable remote wakeup capability for RI pin. (Remote wakeup must be
enabled in SET_USB_CONFIG [Attributes] report 0x60.)
4:2 Reserved
1:0 CONFIG
00: GPIO Input (default)
01: GPIO Open drain output
10: GPIO Push-pull output
11: RI input
Table 26: UART_DATA Pin Bit Positions
Bit
Description
7 PULL_U
0: disable Rx pull-up resistor
1: enable pull-up resistor
6 PULL_D
0: disable Rx pull-down resistor
1: enable pull-down resistor if pull-up is not enabled as well
5 RMTWK
0: disable remote wakeup capability for RX pin
1: enable remote wakeup capability for RX pin. (Remote wakeup must
be enabled in SET_USB_CONFIG [Attributes] report 0x60.)
4:2 Reserved
1:0 CONFIG
00: Reserved
01: TX Open drain output
10: TX Push-pull output
11: Reserved
XR21B1421
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