COM20051I Datasheet, PDF (55/74 Pages) SMSC Corporation – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

A
SET DPTR TO
S TA R T O F
BUF_1
SET DPTR TO
S TA R T O F
BUF_2
SET DPTR TO
S TA R T O F
BUF_3
SET BIT 0
IN RAM_BUF
SET BIT 1
IN RAM_BUF
SET BIT 2
IN RAM_BUF
Y
E X T.
RAM BUFFER
1 FREE?
N
Y
E X T.
RAM BUFFER
2 FREE?
N
Y
E X T.
RAM BUFFER
3 FREE?
N
SET BIT 3
IN RAM_BUF
SET DPTR
TO S TA RT O F
BUF_4
C O P Y PAC K E T
TO EXTERNAL RAM
S E T R X _PAG E =
Y
M IN _ R X _PAG E
M A X R X _PAG E
REACHED?
N
S E T R X _PAG E =
CURRENT
R X _PAG E
CLEAR
IN T
Y
ALL
EXTERNAL
ISSUE ENABLE
N
TO RECEIVE
BUFFERS
COMMAND
FULL?
EXIT
FIGURE 18 – RECEIVE INTERRUPT SERVICE ROUTINE (continued)
SMSC DS – COM20051I
Page 55
Rev. 03/27/2000