MC68HC58 Motorola, MC68HC58 Datasheet - Page 58

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

4-14
MOTOROLA
FROM THE DLC FROM SPI DATA REGISTER
LOAD “LOAD AS FIRST BYTE OF TRANSMIT
DATA” COMMAND BYTE BIT COMBINATION
RETRIEVE THE STATUS BYTE RECEIVED
INTO SPI DATA REGISTER, INITIATING
LOAD FIRST BYTE OF MESSAGE TO
BE TRANSMITTED INTO SPI DATA
IS SPI TRANSFER COMPLETE?
REGISTER, INITIATING SPI
START TX DATA ROUTINE
IS TX FIFO STATUS
ASSERT DLC CS
SPI TRANSFER
CORRECT?
TRANSFER
Figure 4-9 Host/DLC Serial Mode Transmit Routine (Part 1 of 2)
A
YES
YES
NO
NO
DATA LINK CONTROLLER OPERATION
E
FROM THE DLC FROM SPI DATA REGISTER
TRANSMITTED INTO SPI DATA REGISTER,
LOAD NEXT BYTE OF MESSAGE TO BE
RETRIEVE THE DATA BYTE RECEIVED
NEGATION AND ASSERTION OF CS
MINIMUM 2.5 S DELAY BETWEEN
IS SPI TRANSFER COMPLETE?
IS SPI TRANSFER COMPLETE?
INITIATING SPI TRANSFER
NEGATE DLC CS
ASSERT DLC CS
AND DISCARD
B
A
YES
YES
NO
NO
NO
LOAD “LOAD AS TRANSMIT DATA BYTE”
INTO SPI DATA REGISTER, INITIATING
COMMAND BYTE BIT COMBINATION
RECEIVED FROM THE DLC FROM
IS SPI TRANSFER COMPLETE?
ONE BYTE LEFT IN MESSAGE?
RETRIEVE THE STATUS BYTE
SPI DATA REGISTER
IS TX FIFO STATUS
NEGATE DLC CS
SPI TRANSFER
CORRECT?
B
C
TECHNICAL DATA
YES
YES
YES
DLC HOST TRANS FLOW 1
MC68HC58
NO
NO
E