Analog Devices ADuC812 manual MHz Variable Clock Parameter Min Max Unit, External Program Memory

Page 47

ADuC812

		12 MHz		Variable Clock
Parameter		Min	Max	Min	Max	Unit	Figure

EXTERNAL PROGRAM MEMORY
tLHLL	ALE Pulsewidth	127		2tCK – 40		ns	52
tAVLL	Address Valid to ALE Low	43		tCK – 40		ns	52
tLLAX	Address Hold after ALE Low	53		tCK – 30		ns	52
tLLIV	ALE Low to Valid Instruction In		234		4tCK – 100	ns	52
tLLPL	ALE Low to PSEN Low	53		tCK – 30		ns	52
tPLPH	PSEN Pulsewidth	205		3tCK – 45		ns	52
tPLIV	PSEN Low to Valid Instruction In		145		3tCK – 105	ns	52
tPXIX	Input Instruction Hold after PSEN	0		0		ns	52
tPXIZ	Input Instruction Float after PSEN		59		tCK – 25	ns	52
tAVIV	Address to Valid Instruction In		312		5tCK – 105	ns	52
tPLAZ	PSEN Low to Address Float		25		25	ns	52
tPHAX	Address Hold after PSEN High	0		0		ns	52

MCLK

	tLHLL
ALE (O)
	tAVLL	tLLPL	tPLPH
			tLLIV
PSEN (O)			tPLIV
PSEN (O)
			tPXIZ
		tLLAX	tPLAZ
		tLLAX	tPXIX
			tPXIX
PORT 0 (I/O)	PCL (OUT)		INSTRUCTION
PORT 0 (I/O)	PCL (OUT)		(IN)
			(IN)
			tAVIV
			tPHAX
PORT 2 (O)			PCH

Figure 51. External Program Memory Read Cycle

REV. B

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Image 47

Contents General Description Functional Block DiagramADuC812 Table of ContentsDAC Channel Specifications DC ACCURACY11 ADC Channel Specifications DC ACCURACY3Calibrated Endpoint ERRORS5 Temperature SENSOR10Power Supply Monitor Characteristics DAC AC CharacteristicsFLASH/EE Memory Performance CHARACTERISTICS12 Watchdog Timer CharacteristicsIsource = 20 ∝A Power REQUIREMENTS14, 15Digital Outputs Isource = 80 ∝AOrdering Guide Temperature Package Model Range Description OptionPIN Configuration Mnemonic Type Function Thus for a 12-bit converter, this is 74 dB ADC SpecificationsDAC Specifications TerminologyMemory Organization ARCHITECTURE, Main FeaturesBit Name Description Special Function Registers Default Value SFR Address SFR NotesTypical Operation ADC Circuit InformationGeneral Overview ADC Transfer FunctionADCCON1.1 T2C EFHAQ1 AQ0 #ADC ClksBit Location Status Description Location Name DescriptionCS3 CS2 CS1 CS0 CH# Table VI. Some Single-Supply Op Amps Op Amp Model CharacteristicsDriving the A/D Converter Voltage Reference Connections Configuring the ADCADC DMA Mode Dmah and then by Dmap Where the ADC Results are to be written. This is done byExternal memory must be preconfigured. This consists DMAP. Dmal must be written to first, followed byNonvolatile Flash Memory SFR areaByte Program Sequence C6H EconB9H EadrlCommand Byte Command Mode RNG0 FDHMode RNG1Resistor String DAC Functional Equivalent Using the D/A ConverterSource and Sink Current Capability with Vref = VDD = 3 WDR1 C0HPRE2 PRE1 PRE0 PRE2Psmi DFHDCH CMPWcol F8HOOH IspiF7H SPR1SPR0 SPR1 SPR02C Control Register I2CCONCompatible ON-CHIP Peripherals Pin Alternate FunctionT2CON TMOD, TconTR0 TF1TR1 TF0Mode 1 16-Bit Timer/Counter TIMER/COUNTER 0 and 1 Operating ModesMode 3 Two 8-Bit Timer/Counters Rclk C8HTF2 EXF2OFF CAP2 TR2 ModeRclk or Tclk SM2 SM0SM1 SM0 SM1Baud rate in Mode 0 is fixed RCAP2H RCAP2L SmodCLK ET1 A8HEadc ET2Source Vector Address Source Priority DescriptionExternal Memory Interface ADuC812 Hardware Design ConsiderationsClock Oscillator High it tracks the voltage on DVDD. These recommendations Down to 1.2 V or less. The timing diagram of illusADuC812-based system as well as during its normal power-on Level. The external POR circuit must be operationalCore NAs ⋅ Mclk + Normal ModeIdle Mode VDD = 5 VDD = 3System Grounding Schemes Grounding and Board Layout RecommendationsEmbedded Serial Port Debugger In-Circuit Serial Download AccessOther Hardware Considerations ADSIM-Windows Simulator Quickstart Development SystemXTAL1 Rise Time XTAL1 Period 83.33 62.5 1000XTAL1 Width Low XTAL1 Width HighExternal Program Memory 12 MHz Variable Clock Parameter Min Max UnitExternal Data Memory Read Cycle External Data Memory Write Cycle Input Data Hold after Clock Output Data Setup to Clock 700 10t CKInput Data Setup to Clock 300 2t CK + Serial Port Clock Cycle Time 12t CKI2C-COMPATIBLE Interface Timing Parameter Min Max UnitParameter Min Typ Max Unit SPI Master Mode Timing Cpha =Data Output Setup before Sclock Edge 150 SS High after Sclock Edge SPI Slave Mode Timing Cpha =SS to Sclock Edge Data Output Valid after SS Edge Lead Plastic Quad Flatpack Entire Data Sheet has been revisedOutline Dimensions Location Data Sheet changed from REV. a to REV. B

ADuC812

12 MHz

Variable Clock

Parameter

Min

Max

Unit

EXTERNAL PROGRAM MEMORY

Address Hold after PSEN High

Figure 51. External Program Memory Read Cycle

REV. B