MC68HC908JG16 Datasheet, PDF (35/324 Pages) Motorola, Inc – Microcontrollers

General Description
Pin Functions
1.6.3 Oscillator Pins (OSC1 and OSC2)
The OSC1 and OSC2 pins are the connections for the on-chip oscillator
circuit.
1.6.4 External Reset Pin (RST)
A logic zero on the RST pin forces the MCU to a known start-up state.
RST is bidirectional, allowing a reset of the entire system. It is driven low
when any internal reset source is asserted. The RST pin contains an
internal pullup device to V_DD. (See Section 8. System Integration
Module (SIM).)
1.6.5 External Interrupt Pins (IRQ, PTE4/D–)
IRQ is an asynchronous external interrupt pin. IRQ is also the pin to
enter Monitor mode. The IRQ pin contains a software configurable pullup
device to V_DD. PTE4/D– can be programmed to trigger the IRQ interrupt.
(See Section 15. External Interrupt (IRQ).)
1.6.6 Analog Power Supply Pins (V_DDA, V_SSA)
V_DDA and V_SSA are the power supply and ground pins for the analog
portion of the MCU. Connect V_DDA to the same voltage potential as V_DD.
Connect V_SSA to the same voltage potential as V_SS. Decoupling of these
pins should be as per the digital supply.
1.6.7 Analog Voltage Regulator Out (V_REGA)
V_REGA is the 3.3V output of the second on-chip voltage regulator. V_REGA
is used for ADC operation. Decoupling of this pin should be as per the
digital V_REG.
MC68HC908JG16 — Rev. 1.1
Freescale Semiconductor
General Description
Technical Data
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