1- 4
MC68341 USER’S MANUAL
MOTOROLA
Interrupt Control—Provides up to seven discrete interrupt inputs for external devices.
IEEE 1149.1 Test Access Port (JTAG)—Aids in system diagnostics by providing
dedicated, user-accessible test logic that is fully compliant with the IEEE 1149.1
standard for boundary scan testability.
Real Time Clock—The real time clock can be sustained on a separate power supply
for battery backup. This simple counter is driven by 32.768 KHz clock for low power
consumption. The real time clock counts seconds, minutes, hours, days, day of the
week, date of the month, and year with leap year compensation. The real time clock
has internal interrupt generation capability and includes a programmable output pin,
which can provide an interrupt or other output signal based upon an alarm or time
matching function. Software calibration eliminates the need for an external trim
capacitor.
Queued Serial Peripheral Interface (QSPI) Module
The QSPI eases peripheral expansion or interprocessor communications. This function
allows interface to and control of other integrated controllers (such as, MC6805 or
MC68HC11 family devices) and peripherals (such as, LCD drivers, A/D–D/A converters,
digital signal processors, EEPROM). The QSPI can handle up to 16 serial transfers of 8 to
16 bits each or transmit a stream of data up to 256 bits long without CPU intervention,
because of a small RAM in the QSPI. A special wrap-around mode allows the QSPI to
continuously sample a serial peripheral, automatically updating the QSPI RAM for efficient
interfacing to serial analog-to-digital converters.
Timer Module
The timer consists of a 16-bit countdown counter with an 8-bit countdown prescaler for a
composite 24-bit resolution. The finest resolution of the timer is 80 ns with a 25-MHz
system clock (125 ns @ 16.78 MHz). The programmable timer operating modes are input
capture, output compare, square-wave generation, variable duty-cycle square-wave
generation, variable-width single-shot pulse generation, event counting, period
measurement, and pulse-width measurement.
POWER CONSUMPTION MANAGEMENT
The MC68341 is very power efficient due to its advanced 0.8-
HCMOS process
technology and its static logic design. The resulting power consumption is typically
500 mW in full operation—far less than the comparable discrete component
implementation the MC68341 can replace. For applications employing reduced voltage
operation, selection of the MC68341V, which requires only a 3.3-V power supply, reduces
current consumption by 40–60% in all modes of operation (as well as reducing noise
emissions).
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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