参数资料
型号: ST72511R9T3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 18/164页
文件大小: 1043K
代理商: ST72511R9T3/XXX
ST72311R, ST72511R, ST72512R, ST72532R
114/164
CONTROLLER AREA NETWORK (Cont’d)
BAUD RATE PRESCALER REGISTER (BRPR)
Read/Write in Standby mode
Reset Value: 00h
RJW[1:0] determine the maximum number of time
quanta by which a bit period may be shortened or
lengthened to achieve resynchronization.
tRJW =tCAN * (RJW + 1)
BRP[5:0] determine the CAN system clock cycle
time or time quanta which is used to build up the in-
dividual bit timing.
tCAN =tCPU * (BRP + 1)
Where tCPU = time period of the CPU clock.
The resulting baud rate can be computed by the for-
mula:
Note: Writing to this register is allowed only in
Standby mode to prevent any accidental CAN pro-
tocol violation through programming errors.
BIT TIMING REGISTER (BTR)
Read/Write in Standby mode
Reset Value: 23h
BS2[2:0] determine the length of Bit Segment 2.
tBS2 =tCAN * (BS2 + 1)
BS1[3:0] determine the length of Bit Segment 1.
tBS1 =tCAN * (BS1 + 1)
Note: Writing to this register is allowed only in
Standby mode to prevent any accidental CAN pro-
tocol violation through programming errors.
PAGE SELECTION REGISTER (PSR)
Read/Write
Reset Value: 00h
PAGE[2:0] determine which buffer or filter page is
mapped at addresses 0010h to 001Fh.
70
RJW1
RJW0
BRP5
BRP4
BRP3
BRP2
BRP1
BRP0
BR
1
t
CP U
BRP
1
+
()
×
BS1
BS23
++
()
×
--------------------------------------------------------------------------------------------- -
=
70
0
BS22
BS21
BS20
BS13
BS12
BS11
BS10
70
0
000
PAGE
2
PAGE
1
PAGE
0
PAGE2
PAGE1
PAGE0
Page Title
0
Diagnosis
0
1
Buffer 1
0
1
0
Buffer 2
0
1
Buffer 3
1
0
Filters
1
0
1
Reserved
1
0
Reserved
1
Reserved
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