MCIMX27 Motorola Semiconductor Products, MCIMX27 Datasheet - Page 20

• Manufacturer Part Number: MCIMX27
• Manufacturer: Motorola Semiconductor Products

Functional Description and Application Information
NAND Flash device). After the boot procedure completes, the RAM is available as buffer RAM. In
addition, the NAND Flash controller provides an X16-bit and X32-bit interface to the AHB bus on the chip
side, and an X8/X16 interface to the NAND Flash device on the external side.
2.3.25
The Personal Computer Memory Card International Association (PCMCIA) provides the PCMCIA 2.1
standard, which defines the usage of memory and I/O devices as insertable and exchangeable peripherals
for personal computers or PDAs. Examples of these types of devices include CompactFlash and WLAN
adapters.
The pcmcia_if host adapter module provides the control logic for PCMCIA socket interfaces, and requires
some additional external analog power switching logic and buffering. The additional external buffers
allow the pcmcia_if host adapter module to support one PCMCIA socket. The pcmcia_if shares its chip
level I/O with the external interface to memory (EIM) pins. Additional logic is required to multiplex the
EIM and the pcmcia_if on the same pins.
2.3.26
Two on-chip Digital Phase Lock Loop (DPLLs) provide clock generation in digital and mixed
analog/digital chips designed for wireless communication and other applications. The DPLLs produce a
high-frequency chip clock signals with a low frequency and phase jitter.
2.3.27
The Pulse-Width Modulator (PWM) has a 16-bit counter and is optimized to generate sounds from stored
sample audio images; it can also generate tones. The PWM uses 16-bit resolution and a 4 × 16 data FIFO
to generate sound. The 16-bit up-counter has a source selectable clock with 4 × 16 FIFO to minimize
interrupt overhead. Clock-in frequency is controlled by a 12-bit prescaler for the division of a clock.
Capable of sound and melody generation, the PWM has an active-high or active-low configurable output,
and can be programmed to be active in low-power and debug modes. The PWM can be programmed to
generate interrupts at compare and rollover events.
2.3.28
The Real Time Clock (RTC) module maintains the system clock, provides stopwatch, alarm, and
interrupt functions, and supports the following features:
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Full clock—days, hours, minutes, seconds
Minute countdown timer with interrupt
Programmable daily alarm with interrupt
Sampling timer with interrupt
Once-per-day, once-per-hour, once-per-minute, and once-per-second interrupts
Operation at 32.768 kHz or 32 kHz, or 38.4 kHz (determined by reference clock crystal)
Personal Computer Memory Card International Association
(PCMCIA)
Digital Phase Lock Loop (DPLL)
Pulse-Width Modulator (PWM)
Real Time Clock (RTC)
i.MX27 Data Sheet, Advance Information, Rev. 0.1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor