Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 642

Serial Interface
The SCC4 in NMSI mode has its own set of modem control signals:
• TXD4
• RXD4
TCLK4 ← BRG1–BRG4, CLK5–CLK8
•
RCLK4 ← BRG1–BRG4, CLK5–CLK8
•
• RTS4
• CTS4
• CD4
The SMC1 in NMSI mode has its own set of modem control signals:
• SMTXD1
• SMRXD1
SMCLK1 ← BRG1–BRG4, CLK1–CLK4
•
• SMSYN1 (used only in the totally transparent protocol)
The SMC2 in NMSI mode has its own set of modem control signals:
• SMTXD2
• SMRXD2
SMCLK2 ← BRG1–BRG4, CLK5–CLK8
•
• SMSYN2 (used only in the totally transparent protocol)
Unused SCC or SMC signals can be used for other functions or configured for parallel I/O.
20.4 Baud Rate Generators (BRGs)
The CPM contains four independent, identical baud rate generators (BRG) that can be used with the SCCs
and SMCs. The clocks produced by the BRGs are sent to the bank-of-clocks selection logic, where they
can be routed to the SCCs or SMCs. In addition, the output of a BRG can be routed to a pin to be used
externally. The following is a list of baud rate generators' main features:
• Four independent and identical baud rate generators
• On-the-fly changes allowed
• Each baud rate generator can be routed to one or more SCCs or SMCs
• A 16x divider option allows slow baud rates at high system frequencies
• Each BRG contains an autobaud support option
• Each BRG output can be routed to a pin (BRGOn)
20-36
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Freescale Semiconductor