參數(shù)資料
型號(hào): ST72521AR7T1/XXX
廠商: STMICROELECTRONICS
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, PLASTIC, TQFP-64
文件頁(yè)數(shù): 44/199頁(yè)
文件大小: 1979K
代理商: ST72521AR7T1/XXX
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ST72521M/R/AR
138/199
CONTROLLER AREA NETWORK (Cont’d)
10.8.4.2 Paged Registers
LAST IDENTIFIER HIGH REGISTER (LIDHR)
Read/Write
Reset Value: Undefined
LID[10:3] are the most significant 8 bits of the last
Identifier read on the CAN bus.
LAST IDENTIFIER LOW REGISTER (LIDLR)
Read/Write
Reset Value: Undefined
LID[2:0] are the least significant 3 bits of the last
Identifier read on the CAN bus.
LRTR is the last Remote Transmission Request bit
read on the CAN bus.
LDLC[3:0] is the last Data Length Code read on the
CAN bus.
TRANSMIT ERROR COUNTER REG. (TECR)
Read Only
Reset Value: 00h
TEC[7:0] is the least significant byte of the 9-bit
Transmit Error Counter implementing part of the
fault confinement mechanism of the CAN protocol.
In case of an error during transmission, this counter
is incremented by 8. It is decremented by 1 after
every successful transmission. When the counter
value exceeds 127, the CAN controller enters the
error passive state. When a value of 256 is reached,
the CAN controller is disconnected from the bus.
RECEIVE ERROR COUNTER REG. (RECR)
Page: 00h — Read Only
Reset Value: 00h
REC[7:0] is the Receive Error Counter implement-
ing part of the fault confinement mechanism of the
CAN protocol. In case of an error during reception,
this counter is incremented by 1 or by 8 depending
on the error condition as defined by the CAN stand-
ard. After every successful reception the counter is
decremented by 1 or reset to 120 if its value was
higher than 128. When the counter value exceeds
127, the CAN controller enters the error passive
state.
IDENTIFIER HIGH REGISTERS (IDHRx)
Read/Write
Reset Value: Undefined
ID[10:3] are the most significant 8 bits of the 11-bit
message identifier.The identifier acts as the mes-
sage’s name, used for bus access arbitration and
acceptance filtering.
70
LID10
LID9
LID8
LID7
LID6
LID5
LID4
LID3
70
LID2
LID1
LID0
LRTR
LDLC
3
LDLC
2
LDLC
1
LDLC
0
70
TEC7
TEC6
TEC5
TEC4
TEC3
TEC2
TEC1
TEC0
70
REC7
REC6
REC5
REC4
REC3
REC2
REC1
REC0
70
ID10
ID9ID8
ID7ID6
ID5ID4
ID3
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