MC68HC711E9CFNE2 Freescale Semiconductor, MC68HC711E9CFNE2 Datasheet - Page 50

• Manufacturer Part Number: MC68HC711E9CFNE2
• Description: IC MCU 8BIT 512RAM 52-PLC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E9CFNE2

• 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 ~ 85°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: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Central Processor Unit (CPU)
3.3.5 Program Counter (PC)
Technical Data
50
When an interrupt is recognized, the current instruction finishes
normally, the return address (the current value in the program counter)
is pushed onto the stack, all of the CPU registers are pushed onto the
stack, and execution continues at the address specified by the vector for
the interrupt.
At the end of the interrupt service routine, an return-from interrupt (RTI)
instruction is executed. The RTI instruction causes the saved registers
to be pulled off the stack in reverse order. Program execution resumes
at the return address.
Certain instructions push and pull the A and B accumulators and the X
and Y index registers and are often used to preserve program context.
For example, pushing accumulator A onto the stack when entering a
subroutine that uses accumulator A and then pulling accumulator A off
the stack just before leaving the subroutine ensures that the contents of
a register will be the same after returning from the subroutine as it was
before starting the subroutine.
The program counter, a 16-bit register, contains the address of the next
instruction to be executed. After reset, the program counter is initialized
from one of six possible vectors, depending on operating mode and the
cause of reset. See
Test or Boot
Normal
Mode
Central Processor Unit (CPU)
POR or RESET Pin
Table 3-1. Reset Vector Comparison
Table
$FFFE, F
$BFFE, F
3-1.
Clock Monitor
$BFFC, D
$FFFC, D
M68HC11E Family — Rev. 3.2
COP Watchdog
$BFFA, B
$FFFA, B
MOTOROLA