pca82c200t NXP Semiconductors, pca82c200t Datasheet - Page 103
pca82c200t
Manufacturer Part Number
pca82c200t
Description
8-bit Microcontroller With On-chip Can
Manufacturer
NXP Semiconductors
Datasheet
1.PCA82C200T.pdf
(108 pages)
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Philips Semiconductors
1996 Jun 27
LOC
00A0
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8-bit microcontroller with on-chip CAN
OBJ
54E0
C4
03
2415
83
6007
F5D8
75DB96 133
00
00
LINE SOURCE
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; determine the destination address in data-memory for the
; message's Data-Field
ANL
SWAP
RR
; this value is used as an index for an array of 8 bytes
; containing the destination-addresses for the 8 different
; messages. Note, that the #RX_ARRAY_OFFSET is due to the
; program counter-relative access to the array.
ADD
MOVC
RX_ARRAY_OFFSET:
; if a message passes the acceptance-filter of the CAN
; Controller, but the CPU doesn't need it, the array
; entry's value may be set to zero indicating this.
; The following jz instruction cares for this.
JZ
; now copy the Data-Field (only) from CAN- to CPU memory
; with the aid of the DMA-logic. Note, that a TX-DMA is
; performed when writing 8AH (DMA + address 10) into CANADR
; and a RX-DMA is performed when writing 94H (DMA + address 20)
; ... 9DH (DMA + address 29) into CANADR. Here address 22 is
; used to copy just the Data-Field.
MOV
MOV
; the DMA-transfer is done in at maximum 2 instruction cycles.
; During the transfer, neither the data-memory (RAM) nor one
; of the SFRs CANADR, CANDAT, CANCON and
; CANSTA may be accessed by the CPU.
; For simplicity, two NOPs are used here.
NOP
NOP
103
A, #ID2_0_MASK
A
A
A, #RX_ARRAY_START
A, @A + PC
CAN_RX_READY
CANSTA, A
CANADR, #CAN_RX_DMA ; starts RX-DMA at address 22
RX_ARRAY_OFFSET
; use ID.2 ... ID.0 only
; A = 4*ID.2 + 2*ID.1 + ID.0
; data-memory address
Product specification
P8xCE598
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