MC68HC908AP16CFB datasheet(79/440 Pages) MOTOROLA

79 / 440 page

Central Processor Unit (CPU)

Arithmetic/Logic Unit (ALU)

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

C — Carry/Borrow Flag

The CPU sets the carry/borrow flag when an addition operation

produces a carry out of bit 7 of the accumulator or when a subtraction

operation requires a borrow. Some instructions — such as bit test and

branch, shift, and rotate — also clear or set the carry/borrow flag.

1 = Carry out of bit 7

0 = No carry out of bit 7

6.4 Arithmetic/Logic Unit (ALU)

The ALU performs the arithmetic and logic operations defined by the

instruction set.

Refer to the CPU08 Reference Manual (Motorola document order

number CPU08RM/AD) for a description of the instructions and

addressing modes and more detail about the architecture of the CPU.

6.5 Low-Power Modes

The WAIT and STOP instructions put the MCU in low power-consumption

standby modes.

6.5.1 Wait Mode

The WAIT instruction:

•

Clears the interrupt mask (I bit) in the condition code register,

enabling interrupts. After exit from wait mode by interrupt, the I bit

remains clear. After exit by reset, the I bit is set.

•

Disables the CPU clock.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 79 Page - Motorola, Inc