XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 455
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
1.XC908AS60ACFU.pdf
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25.6 Low-Power Modes
25.6.1 Wait Mode
25.6.2 Stop Mode
25.7 TIMA During Break Interrupts
MC68HC908AZ60A — Rev 2.0
MOTOROLA
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
The TIMA remains active after the execution of a WAIT instruction. In
wait mode, the TIMA registers are not accessible by the CPU. Any
enabled CPU interrupt request from the TIMA can bring the MCU out of
wait mode.
If TIMA functions are not required during wait mode, reduce power
consumption by stopping the TIMA before executing the WAIT
instruction.
The TIMA is inactive after the execution of a STOP instruction. The
STOP instruction does not affect register conditions or the state of the
TIMA counter. TIMA operation resumes when the MCU exits stop mode.
A break interrupt stops the TIMA counter and inhibits input captures.
The system integration module (SIM) controls whether status bits in
other modules can be cleared during the break state. The BCFE bit in
the SIM break flag control register (SBFCR) enables software to clear
status bits during the break state (see
on page 168).
To allow software to clear status bits during a break interrupt, write a
logic 1 to the BCFE bit. If a status bit is cleared during the break state, it
remains cleared when the MCU exits the break state.
To protect status bits during the break state, write a logic 0 to the BCFE
bit. With BCFE at logic 0 (its default state), software can read and write
I/O registers during the break state without affecting status bits. Some
Timer Interface Module A (TIMA)
SIM Break Flag Control Register
Timer Interface Module A (TIMA)
Low-Power Modes
Technical Data
455
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