Memory and Memory Interfaces
4.4.3.1 On-Chip Memory
• Up to 160 KB flash memory read/program/erase over full operating voltage and temperature
• Up to 128 KB program flash array
• FlexMemory for additional data/program space or up to 2 KB enhanced EEPROM
• 32 KB FlexNVM
• 2 KB FlexRAM (can be used as normal RAM if enhanced EEPROM is not used)
• Separate block protection for standard flash array and FlexMemory (including data and EEPROM)
• Up to 32 KB random access memory (RAM)
• 32-byte register file, powered in all modes
• Security circuitry to prevent unauthorized access to RAM and flash contents
4.4.3.2 External Bus Interface (Mini-FlexBus)
• Two independent, user-programmable chip-select signals that can gluelessly interface with external RAM, PROM,
EPROM, EEPROM, flash, and other peripherals
• 8-bit and 16-bit port sizes with configuration for multiplexed or nonmultiplexed address and data buses
• Byte, word, and longword transfers
• Programmable address-setup time with respect to the assertion of chip select
• Programmable address-hold time with respect to the negation of chip select and transfer direction
4.4.4 Clocks
• Frequency-locked loop (FLL)
• Digitally controlled oscillator (DCO) with programmable frequency range
• Option to program DCO frequency for a 32.768 kHz external reference clock source
• Internal or external reference clock can be used to control the FLL
• Phase-locked loop (PLL)
• Voltage-controlled oscillator (VCO)
• External reference clock is used as the PLL source
• Modulo VCO frequency divider phase/frequency detector
• Integrated loop filter
• Internal reference clock (IRC) generator
• 32 kHz low range clock with 9 trim bits for accuracy
• 2 MHz fast clock with 3 trim bits
• Low range clock can be used to control the FLL
• Low range or fast clock can be selected as MCU's clock source
• Can be used as a clock source for other on-chip peripherals
• External clock (ERCLK) from the Crystal Oscillator (XOSC)
• Can be used as the FLL and/or PLL source
• Can be selected as the clock source for the MCU
• External clock monitor with reset request capability
• Lock detector with interrupt request capability for use with the PLL
• Auto Trim Machine (ATM) for trimming both the low range and fast internal reference clocks
• Reference dividers for both the FLL and PLL are provided
• Clock source selected can be divided down by 1, 2, 4, 8, or 16
4.4.3
Memory and Memory Interfaces
ColdFire+ Portfolio Product Brief, Rev. 4, 03/2013
16 Freescale Semiconductor, Inc.
