3.8.5 IO3SETTING

Name: IO3SETTING
Offset: 0x05
Property: -

Bit 76543210 
 IDLST3CLKDIV[1:0]OD3SELPU3SELIO3DIRIO3DES[1:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00100011 

Bit 7 – IDLST3 IO3 Pin Idle or Default Output State Selection

This is valid only when the pin is configured as an output pin.
ValueDescription
0 Idle state default output value is logic ‘0’
1 Idle state or default output value is logic ‘1’

Bits 6:5 – CLKDIV[1:0] Clock Reference Out Frequency Selection

This is valid only when the pin is configured as the CLKO pin.
ValueDescription
00 The clock-out frequency is 6 MHz
01 The clock-out frequency is 4 MHz (factory default)
10 The clock-out frequency is 2 MHz
11 The clock-out frequency is 1 MHz

Bit 4 – OD3SEL IO3 Pin Open-Drain Selection

This is valid only when the pin is configured as an output and not as a CLKO pin.
ValueDescription
0 The output pin is not an open-drain pin
1 The output pin is an open-drain pin

Bit 3 – PU3SEL IO3 Pin Pull-Up Enable

This is valid only when the pin is configured as an input.
ValueDescription
0 The internal pull-up is disabled
1 The internal pull-up is enabled

Bit 2 – IO3DIR IO3 Direction

Input or output.
ValueDescription
0 GPIO output (factory default)
1 GPIO input

Bits 1:0 – IO3DES[1:0] IO3 Designation

Input or output.
ValueDescription
00 GPIO3 pin (GPIO3)
01 UART transmit activity (TXA)
10 I2C clock-line low timeout (I2CTO)
11 Clock reference out (CLKO) (factory default)