SIO1007 datasheet(9/108 Pages) MICROCHIP

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DS00002020A-page 9

SIO1007

nRTS1

(SYSOPT0)

Active low Request to Send outputs for

the Serial Port. Handshake output

signal notifies modem that the UART is

ready to transmit data. This signal can

be programmed by writing to bit 1 of

the Modem Control Register (MCR).

The hardware reset will reset the nRTS

signal to inactive mode (high). nRTS is

forced inactive during loop mode

operation.

At the deasserting edge of PCIRST#,

the nRTS pin is latched to determine

the configuration base address: 0 =

Index Base I/O Address bits A[7:0]= 2E

Hex; 1 = Index Base I/O Address bits

A[7:0]==4E Hex.

N/A

VCC

4-2

TXD1

Transmit serial data output for port 1.

O12

N/A

VCC

nCTS1

Active low Clear to Send inputs for the

serial port. Handshake signal which

notifies the UART that the modem is

ready to receive data. The CPU can

monitor the status of nCTS signal by

reading bit 4 of Modem Status Register

(MSR). A nCTS signal state change

from low to high after the last MSR read

will set MSR bit 0 to a 1. If bit 3 of the

Interrupt Enable Register is set, the

interrupt is generated when nCTS

changes state. The nCTS signal has no

effect on the transmitter.

Note:

Bit 4 of MSR is the

complement of nCTS.

VCC

N/A

nDTR1

(SYSOPT1)

Active low Data Terminal Ready

outputs for the serial port. Handshake

output signal notifies modem that the

UART is ready to establish data

communication link. This signal can be

programmed by writing to bit 0 of

Modem Control Register (MCR). The

hardware reset will reset the nDTR

signal to inactive mode (high). nDTR is

forced inactive during loop mode

operation.

At the deasertting edge of PCIRST#,

the nDTR1 pin is latched to determine

the configuration base address: 0 =

Index Base I/O Address bits A[15:8]=00

Hex; 1 = Index Base I/O Address bits

A[15:8]= 16 Hex.

OP14

N/A

VCC

4-2

TABLE 4-1:

PIN FUNCTIONS (CONTINUED)

STQFP

Pin #

Name

Description

Buffer

Name

Input

Buffer

Power

Well

Output

Buffer

Power

Well

Notes

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