ST92F124 datasheet(321/429 Pages) STMICROELECTRONICS

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J1850 Byte Level Protocol Decoder (JBLPD)

J1850 BYTE LEVEL PROTOCOL DECODER (Cont’d)

10.9.7.2 Stacked Registers

See the description of the OPTIONS register to

obtain more information on the map of the regis-

ters of this section.

JBLPD RECEIVER DMA ADDRESS POINTER

R252 - RSEL[3:0]=0000b

Reset Value: xxxx xxxx (xxh)

To select this register, the RSEL[3:0] bits of the

OPTIONS register must be reset

Bit 7:1 = RA[7:1] Receiver DMA Address Pointer.

RDAPR contains the address of the pointer (in the

when the DMA between the peripheral and the

Memory Space is selected. Otherwise, when the

DMA between the peripheral and Register File is

selected, this register has no meaning.

See Section 10.9.6.2 for more details on the use of

this register.

Bit 0 = PS Memory Segment Pointer Selector.

This bit is set and cleared by software. It is only

meaningful if RDCPR.RF/MEM = 1.

0: The ISR register is used to extend the address

of data received by DMA (see MMU chapter)

1: The DMASR register is used to extend the ad-

dress of data received by DMA (see MMU chap-

ter)

JBLPD

RECEIVER

DMA

TRANSACTION

COUNTER REGISTER (RDCPR)

R253 - RSEL[3:0]=0000b

Reset Value: xxxx xxxx (xxh)

To select this register, the RSEL[3:0] bits of the

OPTIONS register must be reset

Bit 7:1 = RC[7:1] Receiver DMA Counter Pointer.

RDCPR contains the address of the pointer (in the

counter when the DMA between Peripheral and

Memory Space is selected. Otherwise, if the DMA

between Peripheral and Register File is selected,

this register points to a pair of registers that are

used as DMA Address register and DMA Transac-

tion Counter.

See Section 10.9.6.1and Section 10.9.6.2 for

more details on the use of this register.

Bit 0 = RF/MEM Receiver Register File/Memory

Selector.

If this bit is set to “1”, then the Register File will be

selected as Destination, otherwise the Memory

space will be used.

0: Receiver DMA with Memory space

1: Receiver DMA with Register File

JBLPD TRANSMITTER DMA ADDRESS POINT-

ER REGISTER (TDAPR)

R254 - RSEL[3:0]=0000b

Reset Value: xxxx xxxx (xxh)

To select this register, the RSEL[3:0] bits of the

OPTIONS register must be reset

Bit 7:1 = TA[7:1] Transmitter DMA Address Point-

er.

TDAPR contains the address of the pointer (in the

when the DMA between the Memory Space and

the peripheral is selected. Otherwise, when the

DMA between Register File and the peripheral is

selected, this register has no meaning.

See Section 10.9.6.2 for more details on the use of

this register.

Bit 0 = PS Memory Segment Pointer Selector.

This bit is set and cleared by software. It is only

meaningful if TDCPR.RF/MEM = 1.

0: The ISR register is used to extend the address

of data transmitted by DMA (see MMU chapter)

1: The DMASR register is used to extend the ad-

dress of data transmitted by DMA (see MMU

chapter)

RA7

RA6

RA5

RA4

RA3

RA2

RA1

RC7

RC6

RC5

RC4

RC3

RC2

RC1

RF/MEM

TA7

TA6

TA5

TA4

TA3

TA2

TA1

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