mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 460

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

Communication Processor Module
TIME—Timer Enable
This bit controls whether the microcontroller’s internal timer can send a tick to the
microcontroller based on the value programmed into the TIMEP field.
Bits 1, 16–23 and 25–31—Reserved
These bits are reserved and must be set to 0.
TIMEP—Timer Period
This field controls the microcontroller’s timer tick. The RISC timer tables are scanned on
each timer tick and the input to the timer tick generator is the general system clock divided
by 1,024. The formula is (TIMEP + 1) 1,024 = (general system clock period). Thus, a value
of 0 stored in these bits gives a timer tick of 1 (1,024) = 1,024 general system clocks and
a value of 63 (decimal) gives a timer tick of 64
DR2M—IDMA Request 2 Mode
This bit controls the IDMA request 1 (DREQ2) sensitivity mode.
DR1M—IDMA Request 1 Mode
This bit controls the IDMA request 0 (DREQ1) sensitivity mode.
DRQP—IDMA Emulation Request Priority
This field controls the priority of the external request signals that relate to the serial
channels. Refer to Section 16.2.3 Communication Between the Microcontroller and
Peripherals for more information.
EIE—External Interrupt Enable
Configure this bit as instructed in the download process of a Motorola-supplied RAM
microcode package. This bit is also used by IDMA channel 1 to enable single-buffer mode,
as described in Section 16.6.3.11.4 Single-Buffer Burst Fly-By Mode .
0 = Stop RISC timer table scanning.
1 = Start RISC timer table scanning.
0 = DREQ2 is edge-sensitive.
1 = DREQ2 is level-sensitive.
0 = DREQ1 is edge-sensitive.
1 = DREQ1 is level-sensitive.
00 = IDMA requests have priority over the serial communication controllers and USB
01 = IDMA requests have priority immediatley following the serial communication
10 = IDMA requests have the lowest priority (option 3).
11 = Reserved.
0 = DREQ1 pin cannot interrupt the microcontroller.
1 = DREQ1 pin can interrupt the microcontroller.
(default).
controllers (option 2).
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
(1,024) = 65,536 general system clocks.
MOTOROLA