SAF784X datasheet(75/93 Pages) NXP

75 / 93 page

SAF784X_2

Product data sheet

Rev. 02 — 9 May 2008

75 of 93

NXP Semiconductors

SAF784x

One chip CD audio device with integrated MP3/WMA decoder

7.11 Timers

• Conforms to the VLSI Peripheral Bus (VPB) interface speciﬁcation

• Clock prescaler for external high-frequency sources

• The VPB timer operates in two fully independent clock domains:

– vpb_clk for accessing control and status registers (76 MHz maximum)

– timer_clk for the timer/counter function (50 MHz maximum)

• The VPB timer can support up to four match registers having:

– Continuous operation with optional interrupt generation on match

– Stop on match, with or without, interrupt generation

– Reset on match, with or without, interrupt generation

• Optional external match notiﬁcation pins with the following features:

– Set LOW on match

– Set HIGH on match

– Toggle on match

– No action on match

• Up to four capture registers and capture trigger pins with optional interrupt generation

on a capture event

• Interrupt generation on match event and capture event

7.12 Watchdog timer

• Conﬁgurable watchdog feature including:

– Watchdog timer restart trigger protection by key

– Watchdog timer reload value protection by key access sequence

– Watchdog timer reset disable (for debug) protection by key

• Interrupt generation watchdog time-out event

7.13 Real-time clock

• Zero wait-state to access all registers from the VPB interface

• Provide coherent fraction and seconds time

• Requirement for external 32 kHz crystal

• Alarm and tick interrupts will be generated even when the VPB clock is switched off

• VPB RTC interrupt

• Real-time clock and VPB clock may be asynchronous (the VPB clock frequency could

be higher or lower than the RTC clock frequency)

• Maximum VPB slave frequency: 50 MHz

7.14 DMA controller

The Single operation DMA interface (SDMA), is a small AHB bus master speciﬁcally

designed for bulk memory transfers over the ARM AHB bus.

SAF784X 数据表(PDF) 75 Page - NXP Semiconductors

SAF784X 数据表(HTML) 75 Page - NXP Semiconductors

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