MC68HC711E9MFNE2 Freescale Semiconductor, MC68HC711E9MFNE2 Datasheet - Page 23

• Manufacturer Part Number: MC68HC711E9MFNE2
• Description: IC MCU 8BIT 512BYTES ROM 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E9MFNE2

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 2MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: OTP
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 52-PLCC
• Processor Series: HC711E
• Core: HC11
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 2 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 8
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1.4.4 E-Clock Output (E)
E is the output connection for the internally generated E clock. The signal from E is used as a timing
reference. The frequency of the E-clock output is one fourth that of the input frequency at the XTAL and
EXTAL pins. When E-clock output is low, an internal process is taking place. When it is high, data is being
accessed.
All clocks, including the E clock, are halted when the MCU is in stop mode. To reduce RFI emissions, the
E-clock output of most E-series devices can be disabled while operating in single-chip modes.
The E-clock signal is always enabled on the MC68HC811E2.
1.4.5 Interrupt Request (IRQ)
The IRQ input provides a means of applying asynchronous interrupt requests to the MCU. Either negative
edge-sensitive triggering or level-sensitive triggering is program selectable (OPTION register). IRQ is
always configured to level-sensitive triggering at reset. When using IRQ in a level-sensitive wired-OR
configuration, connect an external pullup resistor, typically 4.7 kΩ, to V
1.4.6 Non-Maskable Interrupt (XIRQ/V
The XIRQ input provides a means of requesting a non-maskable interrupt after reset initialization. During
reset, the X bit in the condition code register (CCR) is set and any interrupt is masked until MCU software
enables it. Because the XIRQ input is level-sensitive, it can be connected to a multiple-source wired-OR
network with an external pullup resistor to V
Whenever XIRQ or IRQ is used with multiple interrupt sources each source must drive the interrupt input
with an open-drain type of driver to avoid contention between outputs.
Freescale Semiconductor
Figure 1-9. Common Parallel Resonant Crystal Connections
MCU
Figure 1-10. External Oscillator Connections
MCU
EXTAL
XTAL
EXTAL
XTAL
M68HC11E Family Data Sheet, Rev. 5.1
NC
DD
PPE
. XIRQ is often used as a power loss detect interrupt.
10 MΩ
)
EXTERNAL OSCILLATOR
CRYSTAL
CMOS-COMPATIBLE
4 x E
4 x E
C
C
L
L
DD
.
Pin Descriptions
23