MC68HC58 Motorola, MC68HC58 Datasheet - Page 62

• Manufacturer Part Number: MC68HC58
• Description: Data Link Controller
• Manufacturer: Motorola

A
START RX DATA ROUTINE
B
LOAD “FLUSH BYTE” COMMAND BYTE
BIT COMBINATION INTO SPI DATA
DATA REGISTER, INITIATING SPI TRANSFER
ASSERT DLC CS
NO
LOAD DUMMY DATA BYTE INTO
IS SPI TRANSFER COMPLETE?
SPI DATA REGISTER, INITIATING
SPI TRANSFER
YES
RETRIEVE THE DATA BYTE
NO
RECEIVED FROM THE DLC FROM
IS SPI TRANSFER COMPLETE?
SPI DATA REGISTER AND STORE
IN RX MESSAGE RAM BUFFER
YES
RETRIEVE THE STATUS BYTE RECEIVED
NEGATE DLC CS
FROM THE DLC FROM SPI DATA REGISTER
NO
YES
IS COMPLETION CODE AT
DOES MESSAGE PASS SOFTWARE
D
C
MESSAGE FILTER?
HEAD OF RX FIFO?
YES
NO
MINIMUM 2.5 S DELAY BETWEEN
A
NEGATION AND ASSERTION OF CS
DLC HOST REC FLOW 1
Figure 4-11 Host/DLC Serial Mode Receive Routine (Part 1 of 2)
MOTOROLA
DATA LINK CONTROLLER OPERATION
MC68HC58
4-18
TECHNICAL DATA