Freescale Semiconductor, Inc.
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).
The MC68340 has many additional methods of dynamically controlling power
consumption during operation. The frequency of operation can be lowered under software
control to reduce current consumption when performance is less critical. Idle internal
peripheral modules can be turned off to save power (5–10% each). Running a special low
power stop (LPSTOP) instruction shuts down the active circuits in the CPU and peripheral
modules, halting instruction execution. Power consumption in this standby mode is
reduced to about 350 µW. Processing and power consumption can be resumed by
resetting the part or by generating an interrupt with the SIM40's periodic interrupt timer.
1.5 PHYSICAL
The MC68340 is available as 0–16.78 MHz and 0–25.16 MHz, 0°C to +70°C and -40°C to
+85°C, and 5.0 V ±5% and 3.3 V ±0.3 supply voltages (reduced frequencies at 3.3 V).
Thirty-two power and ground leads minimize ground bounce and ensure proper isolation
of different sections of the chip, including the clock oscillator. A 144 pins are used for
signals and power. The MC68340 is available in a gull-wing ceramic quad flat pack
(CQFP) with 25.6-mil (0.001-in) lead spacing or a 15 × 15 plastic pin grid array (PPGA)
with 0.1-in pin spacing.
1.6 COMPACT DISC-INTERACTIVE
The MC68340 was designed to meet the needs of many markets, including compact disc-
interactive (CD-I). CD-I is an emerging standard for a publishing medium that will bring
multimedia to a broad general audience—the consumer. CD-I players combine television
and stereo systems as output devices, with interactive control using a TV remote-control-
like device to provide a multimedia experience selected from software “titles” contained in
compressed form on standard compact discs.
The highly integrated MC68340 is ideal as the central processor for CD-I players. It
provides the M68000 microprocessor code compatibility and DMA functions required by
the CD-I Green Book specification as well as many other useful on-chip functions for a
very cost-effective solution. The extra demands of full-motion video CD-I systems make
the best use of the MC68340 high performance. The MC68340 is CD-I compliant and has
been CD-I qualified. With its low voltage operation, the MC68340V is the only practical
choice for portable CD-I.
MOTOROLA
MC68340 USER’S MANUAL
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