ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 186

• Manufacturer Part Number: ST72521R9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72521R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

Controller area network (CAN)
Note:
Note:
186/276
Baud rate prescaler register (BRPR)
Table 94.
The resulting baud rate can be computed by the formula:
Writing to this register is allowed only in Standby mode to prevent any accidental CAN
protocol violation through programming errors.
Bit timing register (BTR)
Table 95.
Writing to this register is allowed only in Standby mode to prevent any accidental CAN
protocol violation through programming errors.
BRPR
7:6 RJW[1:0]
5:0 BRP[5:0]
BTR
6:4 BS2[2:0]
3:0 BS1[3:0]
Bit
Bit
Reserved
7
R/W_Standby mode
7
7
-
Name
Name
RJW[1:0]
-
BRPR register description
BTR register description
Resynchronization Jump Width
Baud rate prescaler
Reserved; must be kept at ‘0’
Bit Segment 2
Bit Segment 1
6
6
These bits determine the maximum number of time quanta by which a bit period
may be shortened or lengthened to achieve resynchronization.
t
These bits determine the CAN system clock cycle time or time quanta which is
used to build up the individual bit timing.
t
Where t
These bits determine the length of Bit Segment 2.
t
These bits determine the length of Bit Segment 1.
t
RJW
CAN
BS2
BS1
R/W_Standby mode
= t
= t
= t
= t
CAN
CAN
CPU
CAN
BR
CPU
BS2[2:0]
* (BS2 + 1)
* (BS1 + 1)
* (RJW + 1)
* (BRP + 1)
= time period of the CPU clock.
5
5
=
Doc ID 17660 Rev 1
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t
CPU


BRP
4
4
+
1

R/W_Standby mode
1

Function
Function

3
3
BS1
BRP[5:0]
+
BS2
R/W_Standby mode
2
2
+
BS1[3:0]
3

1
1
ST72521xx-Auto
Reset value: 00h
Reset value: 23h
0
0