ST92F124 datasheet(284/429 Pages) STMICROELECTRONICS

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J1850 Byte Level Protocol Decoder (JBLPD)

10.9 J1850 Byte Level Protocol Decoder (JBLPD)

10.9.1 Introduction

The JBLPD is used to exchange data between the

ST9 microcontroller and an external J1850 trans-

ceiver I.C.

The JBLPD transmits a string of variable pulse

width (VPW) symbols to the transceiver. It also re-

ceives VPW encoded symbols from the transceiv-

er, decodes them and places the data in a register.

In-frame responses of type 0, 1, 2 and 3 are sup-

ported and the appropriate normalization bit is

generated automatically. The JBLPD filters out

any incoming messages which it does not care to

receive. It also includes a programmable external

loop delay.

The JBLPD uses two signals to communicate with

the transceiver:

– VPWI (input)

– VPWO (output)

10.9.2 Main Features

■ SAE J1850 compatible

■ Digital filter

■ In-Frame Responses of type 0, 1, 2, 3 supported

with automatic normalization bit

■ Programmable External Loop Delay

■ Diagnostic 4x time mode

■ Diagnostic Local Loopback mode

■ Wide

range of MCU internal frequencies

allowed

■ Low

power

consumption

mode

(JBLPD

suspended)

■ Very low power consumption mode (JBLPD

disabled)

■ Don’t care message filter

■ Selectable VPWI input polarity

■ Selectable Normalization Bit symbol form

■ 6 maskable interrupts

■ DMA transmission and reception with End Of

Block interrupts

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