mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 606

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Communication Processor Module
16.8 THE BAUD RATE GENERATORS
The communication processor module contains four independent, yet identical, baud rate
generators (BRGs) that can be used with the universal serial bus, serial communication
controllers, and serial management controllers. The clocks produced in the baud rate
generator are sent to the bank-of-clocks selection logic, where they can be routed to the
universal serial bus, serial communication controllers, or serial management controllers. In
addition, the output of the baud rate generator can be routed to a pin to be used externally.
The following is a list of the baud rate generators’ main features:
The baud rate generator block diagram is illustrated in Figure 16-61.
• Four independent and identical baud rate generators If you are using Mask Revision
• On-the-fly changes are allowed
• Each baud rate generator can be routed to the universal serial bus, serial
• A 16 divider option allows low baud rates at high system frequencies
• Each baud rate generator contains an autobaud support option
• Three of the baud rate generator outputs can be routed to the BRGOx pin
Base #F98S, there are only two baud rate generators
communication controllers, or serial management controllers.
CLK2 PIN
CLK4 PIN
BRGCLK
RX SOURCE
TX SOURCE
EXTC FIELD
Figure 16-61. Baud Rate Generator Block Diagram
MUX
AUTOBAUD
ATB BIT
CONTROL
Freescale Semiconductor, Inc.
For More Information On This Product,
PRESCALER
MPC823 REFERENCE MANUAL
DIVIDE BY
1 OR 16
DIV 16
Go to: www.freescale.com
COUNTER
BAUD RATE GENERATOR
CD[0:11]
1–4,096
12 BIT
BRGO
CLOCK
x
BANK OF
CLOCKS
AND/OR
TO PIN
MOTOROLA