MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 260

• 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: -

13.4.1.1 Common Fields for Extended and Standard Format Frames
13-4
MOTOROLA
Time Stamp
New Frame
Before RX
NOTES:
RX Length
TX Length
Reserved
RX Code
Table 13-1 describes the message buffer fields that are common to both extended and
standard identifier format frames.
0XY1
1. For TX message buffers, upon read, the BUSY bit should be ignored.
Code
Field
Data
0000
0100
0010
0110
1
$A
$C
$E
$0
$2
$4
$6
$8
Contains a copy of the high byte of the free running timer, which is captured at the beginning of the
identifier field of the frame on the CAN bus.
Refer to Tables 13-2 and 13-3
Length (in bytes) of the RX data stored in offset $6 through $D of the buffer. This field is written by
the TouCAN module, copied from the DLC (data length code) field of the received frame.
Length (in bytes) of the data to be transmitted, located in offset $6 through $D of the buffer. This
field is written by the CPU32, and is used as the DLC field value. If RTR (remote transmission re-
quest) = 1, the frame is a remote frame and will be transmitted without data field, regardless of the
value in TX length.
This field can store up to eight data bytes for a frame. For RX frames, the data is stored as it is re-
ceived from the bus. For TX frames, the CPU32 provides the data to be transmitted within the frame.
This word entry field (16 bits) should not be accessed by the CPU32.
NOT ACTIVE — message buffer is not active.
EMPTY — message buffer is active and empty.
FULL — message buffer is full.
OVERRUN — second frame was received into a full
buffer before the CPU read the first one.
BUSY — message buffer is now being filled with a new
receive frame. This condition will be cleared within 20
cycles.
Table 13-1 Common Extended/Standard Format Frames
Table 13-2 Message Buffer Codes for Receive Buffers
15
Figure 13-4 Standard ID Message Buffer Structure
TIME STAMP
DATA BYTE 0
DATA BYTE 2
DATA BYTE 4
DATA BYTE 6
CAN 2.0B CONTROLLER MODULE (TouCAN)
ID[28:18]
Description
8 7
16-BIT TIME STAMP
RESERVED
CODE
RTR
4 3
Description
DATA BYTE 1
DATA BYTE 3
DATA BYTE 5
DATA BYTE 7
0
LENGTH
0
0
New Frame
RX Code
After RX
0010
0110
0010
0110
—
0
0
CONTROL/STATUS
ID_HIGH
ID_LOW
If a CPU32 read occurs be-
fore the new frame, new re-
ceive code is 0010.
An empty buffer was filled
(XY was 10).
A full/overrun buffer was
filled (Y was 1).
Comment
USER’S MANUAL
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MC68336/376