CAM35C44 datasheet(23/50 Pages) SMSC

23 / 50 page

DRQ_LEV, Bit 0

The DRQ_LEV bit D0 determines the active

state of the DMA Request (DRQ) output pin

(TABLE 1).

If DRQ_LEV is “0” (default), the DRQ pin is

active low. If DRQ_LEV is “1”, the DRQ pin is

active high.

DAC_LEV, Bit 1

The DAC_LEV bit D1 determines the active state

of the DMA Acknowledge (DACK) input pin

(TABLE 1).

If DAC_LEV is “0” (default), the DACK pin is

active low. If DAC_LEV is “1”, the DACK pin is

active high.

CR02 - Infrared Option

The Infrared Option register CR02 determines

the infrared port transmit and receive pin

polarity, the port duplex mode, and the infrared

port protocol.

The controls in the Infrared Option register are

also

duplicated

the

IrCC

2.0

SCE

Configuration Register A.

These controls are

arranged such that the last write from either

source determines the current control state and

is visible in both registers.

CR02 can only be accessed in the configuration

state and only after the CSR has been initialized

to 02H. The default value of this register after

power up is 02H (TABLE 16).

Bits[7:6] in the Infrared Option register are

RESERVED.

TABLE 16 - INFRARED OPTION REGISTER

DEFAULT

CR02

R/W

RES.

IR_

MODE2

IR_

MODE1

IR_

MODE0

HALF

DUPLEX

XMT_

POL

RCV_

POL

0x02

RCV_POL, Bit 0

The RCV_POL bit D0 defines the active state for

the infrared port receive pins.

If RCV_POL is “0” (default), the IRRX pin is

active low. If RCV_POL is “1”, the IRRX pin is

active high.

The RCV_POL pin has no affect when the port is

configured as a 16C550A UART (see section

IR_MODE, Bits 3 - 5 on page 24).

XMT_POL, Bit 1

The XMT_POL bit D1 defines the active state for

the infrared port transmit pins.

If XMT_POL is “0”, the IRTX pin is active low. If

XMT_POL is “1” (default), the IRTX pin is active

high.

The XMT_POL pin has no affect when the port is

configured as a 16C550A UART (see section

IR_MODE, Bits 3 - 5 on page 24).

CAM35C44 Datasheet(PDF) 23 Page - SMSC Corporation

CAM35C44 Datasheet(HTML) 23 Page - SMSC Corporation

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