COM20051I Datasheet, PDF (56/74 Pages) SMSC Corporation – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

C L E A R IN T. (M A S K
OFF FOR
NO N -C HA INING )
S TA RT
READ ARCNET
S TAT U S R E G .
Y
TMA SET?
N
CLEAR T X IN T
(M A S K O F F F O R
NO N -C HA ININ G )
READ
TX_PEND_REG
CLEAR B IT 5
N
BIT 6 S ET?
Y
CLEAR B IT 6
3
STORE TX_PEND
SET BIT 6 AND
STORE TX_PEND
SET LAST_TX =
TX_O F F SET
N
BIT 5 O F
T X _P E N D
SET?
Y
SEND ENABLE TO
T R A N S M IIT C M D.
N
CM D CHAIN
ENABLED?
UNMASK
INTE RRU PT
E X IT
FIGURE 19 – TRANSMIT INTERRUPT SERVICE ROUTINE
SMSC DS – COM20051I
Page 56
Rev. 03/27/2000