EVB9S12XEP100 Freescale Semiconductor, EVB9S12XEP100 Datasheet - Page 620
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EVB9S12XEP100
Manufacturer Part Number
EVB9S12XEP100
Description
BOARD EVAL FOR MC9S12XEP100
Manufacturer
Freescale Semiconductor
Type
MCUr
Datasheet
1.EVB9S12XEP100.pdf
(1328 pages)
Specifications of EVB9S12XEP100
Contents
Module and Misc Hardware
Processor To Be Evaluated
MC9S12XEP100
Data Bus Width
16 bit
Interface Type
RS-232
Silicon Manufacturer
Freescale
Core Architecture
S12
Core Sub-architecture
S12
Silicon Core Number
MC9S12
Silicon Family Name
S12XE
Rohs Compliant
Yes
For Use With/related Products
MC9S12XEP100
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Chapter 16 Freescale’s Scalable Controller Area Network (S12MSCANV3)
1. Read: Anytime
1. The RSTAT[1:0], TSTAT[1:0] bits are not affected by initialization mode.
620
RSTAT[1:0]
TSTAT[1:0]
Write: Anytime when not in initialization mode, except RSTAT[1:0] and TSTAT[1:0] flags which are read-only; write of 1 clears
flag; write of 0 is ignored
WUPIF
CSCIF
Field
5-4
3-2
7
6
Wake-Up Interrupt Flag — If the MSCAN detects CAN bus activity while in sleep mode (see
“MSCAN Sleep
(CANCTL0)”), the module will set WUPIF. If not masked, a wake-up interrupt is pending while this flag is set.
0
1
CAN Status Change Interrupt Flag — This flag is set when the MSCAN changes its current CAN bus status
due to the actual value of the transmit error counter (TEC) and the receive error counter (REC). An additional 4-
bit (RSTAT[1:0], TSTAT[1:0]) status register, which is split into separate sections for TEC/REC, informs the
system on the actual CAN bus status (see
(CANRIER)”). If not masked, an error interrupt is pending while this flag is set. CSCIF provides a blocking
interrupt. That guarantees that the receiver/transmitter status bits (RSTAT/TSTAT) are only updated when no
CAN status change interrupt is pending. If the TECs/RECs change their current value after the CSCIF is
asserted, which would cause an additional state change in the RSTAT/TSTAT bits, these bits keep their status
until the current CSCIF interrupt is cleared again.
0
1
Receiver Status Bits — The values of the error counters control the actual CAN bus status of the MSCAN. As
soon as the status change interrupt flag (CSCIF) is set, these bits indicate the appropriate receiver related CAN
bus status of the MSCAN. The coding for the bits RSTAT1, RSTAT0 is:
00
01
10
11
Transmitter Status Bits — The values of the error counters control the actual CAN bus status of the MSCAN.
As soon as the status change interrupt flag (CSCIF) is set, these bits indicate the appropriate transmitter related
CAN bus status of the MSCAN. The coding for the bits TSTAT1, TSTAT0 is:
00
01
10
11
The CANRFLG register is held in the reset state
mode is active (INITRQ = 1 and INITAK = 1). This register is writable again
as soon as the initialization mode is exited (INITRQ = 0 and INITAK = 0).
No wake-up activity observed while in sleep mode
MSCAN detected activity on the CAN bus and requested wake-up
No change in CAN bus status occurred since last interrupt
MSCAN changed current CAN bus status
RxOK: 0 ≤ receive error counter ≤ 96
RxWRN: 96 < receive error counter ≤ 127
RxERR: 127 < receive error counter
Bus-off
TxOK: 0 ≤ transmit error counter ≤ 96
TxWRN: 96 < transmit error counter ≤ 127
TxERR: 127 < transmit error counter ≤ 255
Bus-Off: transmit error counter > 255
(1)
: transmit error counter > 255
Mode,”) and WUPE = 1 in CANTCTL0 (see
Table 16-11. CANRFLG Register Field Descriptions
MC9S12XE-Family Reference Manual , Rev. 1.23
Section 16.3.2.6, “MSCAN Receiver Interrupt Enable Register
NOTE
Description
Section 16.3.2.1, “MSCAN Control Register 0
1
when the initialization
Freescale Semiconductor
Section 16.4.5.5,
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