MOTOROLA
Chapter 22. Serial Communications Controllers
22-19
Part V. The Communications Processor Module
Figure 22-9. Output Delay from RTS Asserted for Synchronous Protocols
When RTS is asserted, if CTS is not already asserted, delays to the Þrst data bit depend on
when CTS is asserted. Figure 22-10 shows that the delay between CTS and the data can be
approximately 0.5 to 1 bit times or 0 bit times, depending on GSMR_H[CTSS].
Figure 22-10. Output Delay from CTS Asserted for Synchronous Protocols
If CTS is programmed to envelope data, negating it during frame transmission causes a
CTS lost error. Negating CTS forces RTS high and Tx data to become idle. If
GSMR_H[CTSS] is zero, the SCC must sample CTS before a CTS lost is recognized;
otherwise, the negation of CTS immediately causes the CTS lost condition. See
Figure 22-11.
1. A frame includes opening and closing ßags and syncs, if present in the protocol.
TCLK
TXD
Last Bit of Frame Data
First Bit of Frame Data
NOTE
:
(Output)
RTS
(Output)
CTS
(Input)
1. GSMR_H[CTSS] = 0. CTSP is a donÕt care.
TCLK
TXD
Last Bit of Frame Data
First Bit of Frame Data
NOTE
:
CTS Sampled Low Here
1. GSMR_H[CTSS] = 1. CTSP is a donÕt care.
TCLK
TXD
Last Bit of Frame Data
First Bit of Frame Data
NOTE
:
(Output)
RTS
(Output)
CTS
(Input)
(Output)
RTS
(Output)
CTS
(Input)
Summary of Contents for MPC860 PowerQUICC
Page 3: ...MPC860UM AD 07 98 REV 1 MPC860 PowerQUICC ª UserÕs Manual ...
Page 36: ...xxxvi MPC860 PowerQUICC UserÕs Manual MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 78: ...I iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 88: ...1 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 114: ...3 16 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 226: ...8 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
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Page 274: ...III iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
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Page 325: ...MOTOROLA Part IV Hardware Interface IV v Part IV Hardware Interface ...
Page 326: ...IV vi MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
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Page 632: ...21 44 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
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Page 998: ...37 48 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part VI Debug and Test ...
Page 1016: ...A 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1024: ...B 8 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
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