ST72561AR7 STMicroelectronics, ST72561AR7 Datasheet - Page 197

• Manufacturer Part Number: ST72561AR7
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72561AR7

• Hdflash Endurance: 100 cycles, data retention 40 years at 85°C
• 5 Power Saving Modes: Halt, Auto Wake Up From Halt, Active Halt, Wait and Slow

beCAN CONTROLLER (Cont’d)
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.
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.
CAN DIAGNOSIS REGISTER (CDGR)
All bits of this register are set and clear by soft-
ware.
Read / Write
Reset Value: 0000 1100 (0Ch)
Bit 3 = RX CAN Rx Signal
- Read
Monitors the actual value of the CAN_RX Pin.
Bit 2 = SAMP Last Sample Point
- Read
The value of the last sample point.
REC7 REC6 REC5 REC4 REC3 REC2 REC1 REC0
TEC7
7
0
7
7
TEC6
0
TEC5
0
TEC4
0
TEC3
RX
SAMP
TEC2
SILM
TEC1
LBKM
TEC0
0
0
0
Bit 1 = SILM Silent Mode
- Read/Set/Clear
0: Normal operation
1: Silent Mode
Bit 0 = LBKM Loop Back Mode
- Read/Set/Clear
0: Loop Back Mode disabled
1: Loop Back Mode enabled
CAN BIT TIMING REGISTER 0 (CBTR0)
This register can only be accessed by the software
when the CAN hardware is in configuration mode.
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7:6 SJW[1:0] Resynchronization Jump Width
These bits define the maximum number of time
quanta the CAN hardware is allowed to lengthen
or shorten a bit to perform the resynchronization.
Resynchronization Jump Width = (SJW+1).
Bit 5:0 BRP[5:0] Baud Rate Prescaler
These bits define the length of a time quantum.
tq = (BRP+1)/f
For more information on bit timing, please refer to
Section 0.1.4.6 Bit
CAN BIT TIMING REGISTER 1 (CBTR1)
Read / Write
Reset Value: 0001 0011 (23h)
Bit 7 = Reserved. Forced to 0 by hardware.
Bits 6:4 BS2[2:0] Time Segment 2
These bits define the number of time quanta in
Time Segment 2.
Time Segment 2 = (BS2+1)
SJW1 SJW0 BRP5
7
7
0
BS22
BS21
CPU
Timing.
BRP4
BS20
BRP3
BS13
BRP2
BS12
BRP1
BS11
ST72561
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BRP0
BS10
0
0