Processor Users Manual

MOTOROLA Chapter 28. Fast Communications Controllers (FCCs) 28-17

Part IV. Communications Processor Module

Figure 28-7. Output Delay from CTS Asserted

If it is programmed to envelope the data, CTS must remain asserted during frame

transmission or a CTS

lost error occurs. The negation of CTS forces RTS high and the

transmit data to the idle state. If GFMR[CTSS] = 0, the FCC must sample CTS

before a

CTS

lost is recognized. Otherwise, the negation of CTS immediately causes the CTS lost

condition. See Figure 28-8.

1. GFMR_H[CTSS] = 0. CTSP is a donÕt care.

TCLK

TXD

Last Bit of Frame DataFirst Bit Of Frame Data

Note:

CTS Sampled Low

1. GFMR_H[CTSS] = 1. CTSP is a donÕt care.

TCLK

TXD

Last Bit of Frame DataFirst Bit of Frame Data

Note:

(Output)

CTS

(Input)

(Output)

CTS

(Input)