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PXN20RM Datasheet, PDF (61/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller | |||
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Introduction
1.7.25 Media Local Bus (MLB)
The following summarizes the MLB configuration:
⢠Support of 16 logical channels running at a maximum speed of 1024 Fs
⢠Transmission of commands and data and reception of receive status when functioning as the
transmitting device associated with a logical channel address
⢠Reception of commands and data and transmission as receive status responses when functioning
as the receiving device associated with a logical channel address
⢠System channel command handling
⢠Internal DMA operation
⢠Local channel buffer RAM (single port RAM) size of 2048 ï´ 36 bits words
⢠Support for 3-pin only
⢠Support for MLB I/O voltage specs 2.5 V (nominal) and 3.3 V (nominal)
NOTE
The MLB is available on the PXN21 only.
1.7.26 Real Time Counter (RTC)
Real Time counter supports wake-up from Low Power modes or real time clock generation
⢠Configurable resolution for different timeout periods
â 1 sec resolution for > 1 hour period
â 1 ms resolution for 2-second period
⢠Selectable clock sources from:
â Internal 128 kHz RC oscillator
â Internal 16 MHz RC oscillator
â 32 kHz external oscillator
⢠RTC supports continued operation through reset, count only reset manually, or by power on reset
(POR)
1.7.27 JTAG Controller (JTAGC)
The JTAGC is compliant with the IEEE 1149.1-2001standard and has the following main features:
⢠IEEE 1149.1-2001 test access port (TAP) interface
⢠A JCOMP input that provides the ability to share the TAP
⢠A 5-bit instruction register that supports several IEEE 1149.1-2001 defined instructions, as well as
several public and private MCU specific instructions
⢠Three test data registers: Bypass register, boundary scan register and a device identification register
⢠Supporting boundary scan testing
⢠TAP controller state machine
Freescale Semiconductor
PXN20 Microcontroller Reference Manual, Rev. 1
1-19
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