MC68HC58 Motorola, MC68HC58 Datasheet - Page 20

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

2.1.1.13 RST — DLC Reset
2.1.1.14 REXT — External Bias Resistor
2.1.1.15 R/W — Read/Write Strobe
2.1.1.16 V
2.1.1.17 V
2.1.1.18 V
2.1.1.19 V
2.1.1.20 V
2-4
MOTOROLA
This pin is used to input an active-low system reset signal. RST must have an external
pull-up resistor.
This pin connects an external bias resistor to the transceiver. The resistor value deter-
mines the waveform of the transmitted bus signal.
This pin is used to input a data direction control signal to the DLC. This signal is used
in conjunction with the ADDR0 signal to select the DLC at a specific address in the
MCU memory map.
This pin connects a separate switched or unswitched 12 Vdc power supply to the DLC
bus transceiver. This supply should be well regulated and protected against switching
transients.
This pin connects a nominal 5 Vdc power supply to the analog transceiver circuitry in
the DLC. For maximum noise immunity, V
supply path
This pin connects a nominal 5 Vdc power supply to the digital control circuitry in the
DLC. For maximum noise immunity, the V
supply path
This pin provides the analog power ground connection to the DLC. Loss of analog
ground directly affects operation of the LOAD pin. For best noise immunity in opera-
tion, the V
This pin provides the digital power ground connection to the DLC. For best noise im-
munity in operation, the V
path
.
BATT
CC
DD
SSA
SSD
— Analog Power Supply Voltage
— Digital Power Supply Voltage
SSA
— Analog Power Ground
— Digital Power Ground
.
.
— Battery Voltage
ground path should be separate from the V
SIGNAL AND PIN DESCRIPTIONS
SSD
ground path should be separate from the V
CC
DD
supply path should be separate from V
supply path should be separate from V
SSD
ground path
TECHNICAL DATA
SSA
.
MC68HC58
ground
DD
CC