MC68HC08JB1 Datasheet, PDF (29/216 Pages) Motorola, Inc – Microcontrollers

1.5.3 Oscillator Pins (OSC1 and OSC2)
The OSC1 and OSC2 pins are the connections for the on-chip oscillator
circuit.
1.5.4 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).)
1.5.5 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 12. External Interrupt (IRQ).)
1.5.6 Port A Input/Output (I/O) Pins (PTA7/KBA7–PTA0/KBA0)
PTA7/KBA7–PTA0/KBA0 are general-purpose bidirectional I/O port
pins. (See Section 11. Input/Output Ports (I/O).) Each pin contains a
software configurable pullup device to V_REG when the pin is configured
as an input. (See 11.7 Port Options.) Each pin can also be programmed
as an external keyboard interrupt pins. (See Section 13. Keyboard
Interrupt Module (KBI).)
1.5.7 Port C I/O Pins (PTC0)
PTC0 is a general-purpose bidirectional I/O port pin. (See Section 11.
Input/Output Ports (I/O).) This pin contains a software configurable
pullup device to V_REG when the pin is configured as an input. (See 11.7
Port Options.)
MC68HC08JB1 — Rev. 2.1
Freescale Semiconductor
Technical Data
29