CS9211 datasheet(38/62 Pages) NSC

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Revision 2.1

Functional Description (Continued)

3.2.13 General Purpose I/O Pins

The CS9211 provides eight GPIO (General Purpose I/O)

pins. There are two 32-bit registers used for programming

the GPIO pins:

• GPIO Control Register (Offset 438h):

— TYPE Bits [7:0] - Allows for setting each GPIO pin’s

direction (i.e., input or output).

— MODE Bits [15:8] - Selects pins mode (i.e., normal

mode or weak pull-up/down mode).

— PUPD Bits [23:16] - Enables selected pull-up/down

mode (as long as corresponding MODE bit is

enabled and TYPE bit is set as an output).

• GPIO Data Register (Offset 434h)

— DATA Bits [7:0] - Contain direct values of the GPIO

pins. Write operations to the corresponding GPIO

pins should be done only for bits defined as outputs.

Reads from the data register will read the last written

value if the pin is an output.

— STS Bits [15:8] are read only status bits. The valid

GPIO pins’ status can be read from those pins.

Table 3-19 "GPIO Pin Programming Registers" on page 38

gives the bit formats of the registers used for programming

the GPIO pins.

Table 3-19. GPIO Pin Programming Registers

Bit

Name

Description

Offset 434h-437h

GPIO Data Register (R/W)

Reset Value = xxxxxx00h

31:16

RSVD

Reserved (Read Only)

GPIO7_STS

GPIO7 Pin State (Read Only): Reports the value of pin GPIO7 when it is configured as an input.

GPIO6_STS

GPIO6 Pin State (Read Only): Reports the value of pin GPIO6 when it is configured as an input.

GPIO5_STS

GPIO5 Pin State (Read Only): Reports the value of pin GPIO5 when it is configured as an input.

GPIO4_STS

GPIO4 Pin State (Read Only): Reports the value of pin GPIO4 when it is configured as an input.

GPIO3_STS

GPIO3 Pin State (Read Only): Reports the value of pin GPIO3 when it is configured as an input.

GPIO2_STS

GPIO2 Pin State (Read Only): Reports the value of pin GPIO2 when it is configured as an input.

GPIO1_STS

GPIO1 Pin State (Read Only): Reports the value of pin GPIO1 when it is configured as an input.

GPIO0_STS

GPIO0 Pin State (Read Only): Reports the value of pin GPIO0 when it is configured as an input.

GPIO7_DATA

GPIO7 Pin Configuration: Reflects the level of GPIO7. 0 = Low, 1 = High. (Note)

GPIO6_DATA

GPIO6 Pin Configuration: Reflects the level of GPIO6. 0 = Low, 1 = High. (Note)

GPIO5_DATA

GPIO5 Pin Configuration: Reflects the level of GPIO5. 0 = Low, 1 = High. (Note)

GPIO4_DATA

GPIO4 Pin Configuration: Reflects the level of GPIO4. 0 = Low, 1 = High. (Note)

GPIO3_DATA

GPIO3 Pin Configuration: Reflects the level of GPIO3. 0 = Low, 1 = High. (Note)

GPIO2_DATA

GPIO2 Pin Configuration: Reflects the level of GPIO2. 0 = Low, 1 = High. (Note)

GPIO1_DATA

GPIO1 Pin Configuration: Reflects the level of GPIO1. 0 = Low, 1 = High. (Note)

GPIO0_DATA

GPIO0 Pin Configuration: Reflects the level of GPIO0. 0 = Low, 1 = High. (Note)

Note: Bits [7:0] contain the direct values of the GPIO pins. Write operations can be done only for GPIOs that are defined as outputs.

Reads from these bits read the last written value if the GPIO pin is configured as an output. The direction of the GPIO pins is con-

trolled through Offset 438h[7:0].

Offset 438h-43Bh

GPIO Control Register (R/W)

Reset Value = 00000000h

31:24

RSVD

Reserved:Set to 0.

GPIO7_PUPD

GPIO7 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO6_PUPD

GPIO6 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO5_PUPD

GPIO5 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO4_PUPD

GPIO4 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO3_PUPD

GPIO3 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO2_PUPD

GPIO2 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO1_PUPD

GPIO1 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO0_PUPD

GPIO0 Pin Pull-up or Pull-down Mode: 0 = Pull-down mode; 1 = Pull-up mode. (Note)

GPIO7_MODE

GPIO7 Pin Mode: 0 = Normal mode; 1 = Weak pull-up or weak pull-down mode.

GPIO6_MODE

GPIO6 Pin Mode: 0 = Normal mode; 1 = Weak pull-up or weak pull-down mode.

GPIO5_MODE

GPIO5 Pin Mode: 0 = Normal mode; 1 = Weak pull-up or weak pull-down mode.

GPIO4_MODE

GPIO4 Pin Mode: 0 = Normal mode; 1 = Weak pull-up or weak pull-down mode.

GPIO3_MODE

GPIO3 Pin Mode: 0 = Normal mode; 1 = Weak pull-up or weak pull-down mode.

GPIO2_MODE

GPIO2 Pin Mode: 0 = Normal mode; 1 = Weak pull-up or weak pull-down mode.

CS9211 Datasheet(PDF) 38 Page - National Semiconductor (TI)

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