ST7FMC1M2T3 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

ST7FMC1M2T3

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

LINSCI™ SERIAL COMMUNICATION INTERFACE (LIN Mode) (cont’d)

LIN PRESCALER FRACTION REGISTER

will effectively update LDIV and so the clock gen-

(LPFR)

eration.

Read/Write

Reset Value: 0000 0000 (00h)

2. In LIN Slave mode, if the LPR[7:0] register is

equal to 00h, the transceiver and receiver input

7

0

clocks are switched off.

0

0

0

0

LPFR LPFR LPFR LPFR

3

2

1

0

Bits 7:4 = Reserved.

Bits 3:0 = LPFR[3:0] Fraction of LDIV

These 4 bits define the fraction of the LIN Divider

(LDIV):

LPFR[3:0]

0h

1h

...

Eh

Fh

Fraction (LDIV)

0

1/16

...

14/16

15/16

1. When initializing LDIV, the LPFR register must

be written first. Then, the write to the LPR register

Examples of LDIV coding:

Example 1: LPR = 27d and LPFR = 12d

This leads to:

Mantissa (LDIV) = 27d

Fraction (LDIV) = 12/16 = 0.75d

Therefore LDIV = 27.75d

Example 2: LDIV = 25.62d

This leads to:

LPFR = rounded(16*0.62d)

= rounded(9.92d) = 10d = Ah

LPR = mantissa (25.620d) = 25d = 1Bh

Example 3: LDIV = 25.99d

This leads to:

LPFR = rounded(16*0.99d)

= rounded(15.84d) = 16d

135/309

1

Share Link: