MFC2000 datasheet(260/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

13-2

Conexant

100723A

GPIO3

GPIO3 is multiplexed with the DMA acknowledge of the DMA channel

1 (DMAACK1), it is also used as SSRXD2 input. If this pin is used as

SSRXD2, the direction of this pin needs to be set as input and the

DMAACK1 function must be disabled.

If this pin is used as DMAACK1, the GPIO direction and data setting

for this pin is no longer valid. This function is enabled by setting

EXTDMA1SEL to 1.

If this pin is used as GPIO, the direction of this pin is controlled by bit 3

of the GPIODir register. The GPIO3 input/output value is controlled by

bit 3 of the GPIOData register.

GPIO[7:4]

GPIO[7:4] are multiplexed with general chip selects on pins

GPIO7/CS5n, GPIO6/CS4n, GPIO5/CS3n, and GPIO4/CS2n. These

pins are selected as GPIO when the corresponding bits in the

GPIOConfig1 register are set to 0. The direction of these pins is

controlled by the bits 7-4 in the GPIODir register. The GPIO[7:4]

input/output values are controlled by the bits 7-4, respectively, of the

GPIOData register.

In addition, the GPIO[5]/CS3n pin is also multiplexed with the PWM3

signal. See the register description in the PWM section for settings.

GPIO6 can also used as input pin for EV_CLK and EADC_D[3], if this

function is selected, the direction control for GPIO6 must be set to 0.

GPIO8

GPIO8 is multiplexed with SSSTA1 and SC_CLK1/2B, this pin is also

used as the interrupt request 11 (IRQ11) input. If this pin is used as

IRQ11, the direction of this pin needs to be set as input. If this pin is

not used as IRQ11, the interrupt channel 11 needs to be disabled by

setting the IRQEnable register in the Interrupt Controller.

If SSSTA1 function is selected, the bit 15 of GPIOConfig1 register

must be set to 1. To enable SC_CLK1/2B function, bit 15 of

GPIOConfig1 must be set to 0 and bit 18 of this register set to 1. Only

when both bit15 and bit2 of the GPIOConfig2 register are set to 0, the

GPIO8 pin is enabled as GPIO.

When GPIO function is enabled, the direction of this pin is controlled

by bit 8 of the GPIODir register. The GPIO8 input/output value is

controlled by bit 8 of the GPIOData register.

GPIO9

GPIO9 is also used as the interrupt request 13 (IRQ13n) input or

EADC_D[2] input. If this pin is used as IRQ13n or EADC_D[2], the

direction of this pin needs to be set as input. If this pin is not used as

IRQ13n, the interrupt channel 13 needs to be disabled by setting the

IRQEnable register in the Interrupt Controller.

The direction of this pin is controlled by bit 9 of the GPIODir register.

The GPIO9 input/output value is controlled by bit 9 of the GPIOData

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