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Nations Technologies Inc.
Tel
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+86-755-86309900
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info@nationstech.com
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
MAC signal
Pin configuration
ETH_MII_RXD3
Input floating (reset state)
ETH MII RX ER
Input floating (reset state)
Ethernet
Ethernet
Push-pull alternate output, high
speed (50MHz)
ETH_MII_TXD0
ETH_RMII_TXD0
Push-pull alternate output, high
speed (50MHz)
ETH_MII_TXD1
ETH_RMII_TXD1
Push-pull alternate output, high
speed (50MHz)
ETH_PPS_OUT
Push-pull alternate output, high
speed (50MHz)
ETH_MII_TXD3
Push-pull alternate output, high
speed (50MHz)
ETH_RMII_CRS_DV
Input floating (reset state)
ETH_MII_RXD0
ETH_RMII_RXD0
Input floating (reset state)
ETH_MII_RXD1
ETH_RMII_RXD1
Input floating (reset state)
ETH_MII_RXD2
Input floating (reset state)
ETH_MII_RXD3
Input floating (reset state)
Table 7-50 USB
USB pin
GPIO configuration
USB_DM
USB_DP
Once the USB module is enabled,
these pins are automatically
connected to the internal USB
transceiver.
Table 7-51 Other
pin
Alternate function
GPIO configuration
TAMPER-RTC
RTC output
When configuring BKP_CR and
BKP_RTCCR registers, it is forced by
hardware.
Intrusion event input
MCO
Clock output
Push-pull alternate output
EXTI input line
External interrupt input
Input floating or pull-up input or input
pull-down
7.2.7
GPIO locking mechanism
The locking mechanism is used to freeze the I/O configuration to prevent accidental changes. When a LOCK program
is executed on a port bit, the port configuration cannot be changed until the next reset. Refer to the port configuration
lock register GPIOx_PLOCK_CFG.
PLOCKK_CFG is GPIOx_PLOCK_CFG[16], which will become 1 only after the PLOCKK_CFG is operated