MC68HC58 Motorola, MC68HC58 Datasheet - Page 23

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

2.2 MC68HC58 DLC Serial Mode
2.2.1 DLC Serial Mode Pin Function
2.2.1.1 BUS — SAE J1850 Multiplex Bus
2.2.1.2 CS — DLC Chip-Select
MC68HC58
TECHNICAL DATA
The MC68HC58 DLC communicates with the host MCU via a standard serial periph-
eral interface (SPI) when in serial mode. Interface timing is based on a serial clock sig-
nal (SCLK) provided by the host MCU. Motorola M68HC05, M68HC11, M68HC16,
and M68300 series MCUs have SPI capabilities, but any host MCU that meets the
clock specification can be used. Refer to Figure 2-1 for serial mode pinout information.
Table 2-2 summarizes DLC serial mode pin function. Detailed discussion of each
function follows. Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for more
information on electrical specifications.
This pin connects the DLC to the SAE J1850 multiplex bus. The bus signal is driven
to a nominal 7 Vdc with respect to the bus load in an active level; it is grounded through
the bus load in a passive level.
This pin is used to input the DLC serial data exchange enable signal. It has a nominal
15 k internal pull-up resistor.
Table 2-2 MC68HC58 DLC Serial Mode Pin Functions
PRLMD
Name
LOAD
OSC1
OSC2
PSEN
REXT
V
SCLK
SIMO
SOMI
V
V
LITO
LOTI
BUS
RST
V
V
INT
CS
BATT
SSA
SSD
CC
DD
SIGNAL AND PIN DESCRIPTIONS
Power supply
Power supply
Power supply
Power supply
Power supply
Input/Output
Input/Output
Input/Output
Output
Output
Output
Output
Type
Input
Input
Input
Input
Input
Input
Input
Input
Parallel/serial mode select signal
Transceiver power connection
Logic in transceiver out signal
Logic out transceiver in signal
External reference connection
External bus load connection
Transceiver biasing resistor
Power supply status signal
External clock connection
Slave in master out signal
Slave out master in signal
Analog power connection
Digital power connection
DLC chip-select signal
Serial bus connection
DLC interrupt request
DLC reset signal
SPI serial clock
Analog ground
Digital ground
Function
MOTOROLA
2-7