COM20051I Datasheet, PDF (54/74 Pages) SMSC Corporation – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

RX_ISR
PUSH DPTR, PSW
SAVE A, HI_ADDR
& LO_ADDR
DISABLE INTRPTS
READ STATUS
REGISTER;
SAVE AS
STAT_REG
READ
RX_PAGE REG
MASK OUT ALL
BITS EXCEPT 3
LSB'S TO GET
ADDR OFFSET
SWAP LOWER &
UPPER NIBBLES
TO MAKE 2ND
RX_CMD THE IST
READ
RAM_BUF_REG
A
FIGURE 18 – RECEIVE INTERRUPT SERVICE ROUTINE
SMSC DS – COM20051I
Page 54
Rev. 03/27/2000