COM20051 Datasheet, PDF (61/82 Pages) List of Unclassifed Manufacturers – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

A
SET DPTR TO
START OF
BUF_1
SET DPTR TO
START OF
BUF_2
SET DPTR TO
START OF
BUF_3
SET BIT 0
IN RAM_BUF
SET BIT 1
IN RAM_BUF
SET BIT 2
IN RAM_BUF
Y
EXT.
RAM BUFFER
1 FREE?
N
Y
EXT.
RAM BUFFER
2 FREE?
N
Y
EXT.
RAM BUFFER
3 FREE?
N
SET BIT 3
IN RAM_BUF
SET DPTR
TO START OF
BUF_4
COPY PACKET
TO EXTERNAL RAM
SET RX_PAGE =
Y
MIN_RX_PAGE
MAX RX_PAGE
REACHED?
N
SET RX_PAGE =
CURRENT
RX_PAGE
CLEAR
INT
Y
ALL
EXTERNAL
ISSUE ENABLE
N
TO RECEIVE
BUFFERS
COMMAND
FULL?
EXIT
FIGURE 18 – RECEIVE INTERRUPT SERVICE ROUTINE (continued)
61