MC68HC58 Motorola, MC68HC58 Datasheet - Page 18

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

2.1.1 DLC Parallel Mode Pin Function
2.1.1.1 ADDR0 — Address Bit
2.1.1.2 BUS — SAE J1850 Multiplex Bus
2.1.1.3 CS — DLC Chip-Select
2-2
MOTOROLA
Table 2-1 summarizes DLC pin functions when operating in parallel mode. Detailed
discussion of each function follows. Refer to APPENDIX A ELECTRICAL CHARAC-
TERISTICS for more information on electrical specifications.
This pin is used in conjunction with the R/W signal to address the DLC in the MCU
memory map. Although the name ADDR0 implies that the pin should be connected to
address line 0, it can in fact be connected to any address line to place it at a desired
location in memory.
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 when in an active level; it is grounded
through the bus load when in a passive level.
This pin is used to input the DLC parallel data exchange enable signal. It has a nominal
15 k internal pull-up resistor.
Table 2-1 MC68HC58 DLC Parallel Mode Pin Function
DATA[7:0]
PRLMD
ADDR0
Name
LOAD
OSC1
OSC2
PSEN
V
ECLK
REXT
V
LITO
LOTI
V
BUS
RST
R/W
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
Input/Output
Output
Output
Output
Type
Input
Input
Input
Input
Input
Input
Input
Input
Input
Bidirectional three-state data bus
Parallel/serial mode select signal
External reference connection
Transceiver power connection
External bus load connection
Transceiver biasing resistor
Power supply status signal
External clock connection
DLC data transfer control
Analog power connection
Digital power connection
Logic in transceiver out
Logic out transceiver in
DLC chip-select signal
DLC interrupt request
Address select signal
Serial data signal
DLC reset signal
6800 bus clock
Analog ground
Digital ground
Function
TECHNICAL DATA
MC68HC58