MC68340 datasheet(334/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

7- 39

TxCTS—Transmitter Clear-to-Send

1 = Enables clear-to-send operation. The transmitter checks the state of the

CTS

≈

input each time it is ready to send a character. If

CTS

≈ is asserted, the character

is transmitted. If

CTS

≈ is negated, the channel TxDx remains in the high state,

and the transmission is delayed until

CTS

≈ is asserted. Changes in CTS≈ while

a character is being transmitted do not affect transmission of that character. If

both TxCTS and TxRTS are enabled, TxCTS controls the operation of the

transmitter.

0 = The

CTS

≈ has no effect on the transmitter.

SB3–SB0—Stop-Bit Length Control

These bits select the length of the stop bit appended to the transmitted character as

listed in Table 7-10. Stop-bit lengths of nine-sixteenth to two bits, in increments of one-

sixteenth bit, are programmable for character lengths of six, seven, and eight bits. For a

character length of five bits, one and one-sixteenth to two bits are programmable in

increments of one-sixteenth bit. In all cases, the receiver only checks for a high

condition at the center of the first stop-bit position—i.e., one bit time after the last data

bit or after the parity bit, if parity is enabled.

If an external 1

× clock is used for the transmitter, MR2 bit 3 = 0 selects one stop bit, and

MR2 bit 3 = 1 selects two stop bits for transmission.

Table 7-10. SBx Control Bits

SB3

SB2

SB1

SB0

Length 6-8 Bits

Length 5 Bits

0.563

1.063

0.625

1.125

0.688

1.188

0.750

1.250

0.813

1.313

0.875

1.375

0.938

1.438

1.000

1.500

1.563

1.625

1.688

1.750

1.813

1.875

1.938

2.000

Freescale Semiconductor, Inc.

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