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參數資料
| 型號： | MC68HC58FN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數： | 20/102頁 |
| 文件大小： | 700K |
| 代理商： | MC68HC58FN |
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MOTOROLA
SIGNAL AND PIN DESCRIPTIONS
MC68HC58
2-8
TECHNICAL DATA
2.2.1.3 INT — DLC Interrupt Request
This pin is used to output an open drain active-low interrupt request signal to the MCU.
The signal is fully compatible with M68HC05, M68HC11, M68HC16, and M68300 in-
terrupt request inputs. INT must have an external pull-up resistor.
2.2.1.4 LITO — Logic In Transceiver Out
This pin is an external tap on the internal receive signal sent from the transceiver to
the control logic. It is used for testing only, and must be left unconnected for normal
operation.
2.2.1.5 LOAD — External Bus Load
This pin provides an internal ground connection for the SAE J1850 multiplex bus load
resistor. If DLC analog ground is lost, LOAD goes to a high-impedance state.
2.2.1.6 LOTI — Logic Out Transceiver In
This pin is an external tap on the internal transmit signal sent from the control logic to
the transceiver. It is used for testing only, and must be left unconnected for normal op-
eration.
2.2.1.7 OSC1, OSC2 — External Oscillator
The DLC can operate with either an external clock signal or an external ceramic res-
onator. These pins support connection of both types of clock. If an external clock
source is used, the signal is input via OSC1, and OSC2 is left floating. If a resonator
is used, it is connected between OSC1 and OSC2.
2.2.1.8 PRLMD —Parallel Mode
This pin is used to select the desired MCU interface mode. When this pin is pulled
down from VDD, the serial mode is selected.
2.2.1.9 PSEN — Power Supply Enable
This pin provides an external VBATT source when the DLC is active. It assumes high-
impedance state when the DLC is in standby mode.
2.2.1.10 RST — DLC Reset
This pin is used to input an active-low system reset signal. RST must have an external
pull-up resistor.
2.2.1.11 REXT — External Bias Resistor
This pin connects an external bias resistor to the transceiver. The resistor value deter-
mines the waveform of the transmitted BUS signal.
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