MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 267

• Manufacturer Part Number: MC68376BGMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BGMAB20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Ram Size: 7.5K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

13.5 TouCAN Operation
13.5.1 TouCAN Reset
13.5.2 TouCAN Initialization
MC68336/376
USER’S MANUAL
The free-running timer can optionally be reset upon the reception of a frame into mes-
sage buffer 0. This feature allows network time synchronization to be performed.
The basic operation of the TouCAN can be divided into three areas:
Example sequences for performing each of these processes is given in the following
paragraphs.
The TouCAN can be reset in two ways:
Following the negation of reset, the TouCAN is not synchronized with the CAN bus,
and the HALT, FRZ, and FRZACK bits in the module configuration register are set. In
this state, the TouCAN does not initiate frame transmissions or receive any frames
from the CAN bus. The contents of the message buffers are not changed following re-
set.
Any configuration change/initialization requires that the TouCAN be frozen by either
asserting the HALT bit in the module configuration register or by reset.
Initialization of the TouCAN includes the initial configuration of the message buffers
and configuration of the CAN communication parameters following a reset, as well as
any reconfiguration which may be required during operation. The following is a generic
initialization sequence for the TouCAN:
• Reset and initialization of the module
• Transmit message handling
• Receive message handling
• Hard reset, using one of the IMB reset lines.
• Soft reset, using the SOFTRST bit in the module configuration register.
A. Initialize all operation modes
B. Initialize message buffers
C. Initialize mask registers for acceptance mask as needed
D. Initialize TouCAN interrupt handler
1. Initialize the transmit and receive pin modes in control register 0
2. Initialize the bit timing parameters PROPSEG, PSEGS1, PSEG2, and RJW
3. Select the S-clock rate by programming the PRESDIV register.
4. Select the internal arbitration mode (LBUF bit in CANCTRL1).
1. The control/status word of all message buffers must be written either as an
2. All other entries in each message buffer should be initialized as required.
1. Initialize the interrupt configuration register (CANICR) with a specific
(CANCTRL0).
in control registers 1 and 2 (CANCTRL[1:2]).
active or inactive message buffer.
request level and vector base address.
CAN 2.0B CONTROLLER MODULE (TouCAN)
MOTOROLA
13-11