TMS320AV7110 datasheet(81/131 Pages) TI

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DSP

TMS320AV7110

Revision 3.1

10/08/99 22:18

Page 81

Table 43. I/O Control/Status Registers, IOCSRn

Bit Number

Name

Description

31-6

Reserved

Set to 0 (read only)

gpio_en

Selects register for muxed gpios, gpio=0, other=1(default)

ddio

Delta detect bit:

Configured as Output: (cio = 1)

Always Reads as a ‘0’

Configured as Input: (cio=0)

Reads a ‘1’ if bit 0 has changed since ddio was last cleared.

Otherwise reads a ‘0’

NOTE: Always write a ‘1’ to this bit when enabling IRQ

generation. This will clear the ddio bit.

3:2

gpio_irq1:0

See Table 44

cio

configure I/O:

0 = input

1 = output

IO bit:

Writeable when IO is configured as an output (cio=1).

Reads value on IO pin when IO is configured as input (cio=0).

Table 44. GPIO_IRQ Bit Definitions

gpio_irq1

gpio_irq0

Function

Disable IRQ

An IRQ is generated on the Rising Edge

An IRQ is generated on the Falling Edge

An IRQ is generated on a State Change

14.8 I

2C Interface

The ‘AV7110 includes an Inter Integrated Circuit (I

2C) serial bus interface that can act as either a single

master (default) or slave. Only the ‘standard mode’ (100 kbit/s) I

2C-bus system is implemented; ‘fast

mode’ is not supported. The interface uses 7-bit addressing only. In slave mode, the address of the

‘AV7110 is programmed by an API. In master mode, the ‘AV7110 initiates and terminates transfers

and generates clock signals.

To put the device in slave mode, the ARM must write to a control register in the block. The API must

set the slave mode select and a 7-bit address for the ‘AV7110. It must also send a software reset to the

2C to complete the transition to slave mode.

In slave mode, when the programmable address bits match the applied address, the ‘AV7110 will

respond accordingly. The ‘AV7110 will also respond to general call commands issued to address 0 (the

general call address) that change the programmable part of the slave address. These commands are

0x04 and 0x06 No other general call commands are acknowledged, and no action is taken.

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