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I/O Control Registers

Table 11-20. IOCFG9 Register Field Descriptions (continued)

Bit Field Type Reset Description

15 RESERVED R X

Software should not rely on the value of a reserved. Writing any

other value than the reset value may result in undefined behavior.

14-13 PULL_CTL R/W 3h

Pull control

1h = DWN : Pull down

2h = UP : Pull up

3h = DIS : No pull

12 SLEW_RED R/W X

0: Normal slew rate 1: Enables reduced slew rate in output driver.

11-10 IOCURR R/W X

Selects IO current in combination with IOSTR

0h = 2MA : 2 mA

1h = 4MA : 4 mA

2h = 4_8MA : 4 or 8 mA 8 mA if IO is double drive strength

9-8 IOSTR R/W X

Select drive strength IO

0h = Automatic drive strength (2/4/8 mA@VDDS)

1h = Minimum drive strength (2/4/8 mA@3.3V)

2h = MED : Medium drive strength (2/4/8 mA@2.5V)

3h = Maximum drive strength (2/4/8 mA@1.8V)

7-6 RESERVED R X

Software should not rely on the value of a reserved. Writing any

other value than the reset value may result in undefined behavior.

921

SWCU117A–February 2015–Revised March 2015 I/O Control

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