Rainbow-electronics AT89C4051 User Manual

1Features• Compatible with MCS®51 Products• 4K Bytes of Reprogrammable Flash Memory• Endurance: 1,000 Write/Erase Cycles• 2.7V to 6V Operating Range•

10AT89C40511001D–06/01Figure 3. Programming the Flash MemoryFigure 4. Verifying the Flash MemoryPPAT89C4051P3.1RDY/BSYAT89C4051

AT89C405111Note: 1. Only used in 12-volt programming mode.Flash Programming and Verification WaveformsFlash Programming and Verification Characteristi

12AT89C40511001D–06/01Notes: 1. Under steady state (non-transient) conditions, IOL must be externally limited as follows:Maximum IOL per port pin: 20

13AT89C40511001D–06/01External Clock Drive WaveformsExternal Clock DriveSymbol ParameterVCC = 2.7V to 6.0V VCC = 4.0V to 6.0VUnitsMin Max Min Max1/tCL

14AT89C40511001D–06/01Shift Register Mode Timing WaveformsAC Testing Input/Output Waveforms(1)Note: 1. AC Inputs during testing are driven at VCC - 0.

15AT89C40511001D–06/01Power-Down Mode Notes: 1. XTAL1 tied to GND for ICC (power-down)2. P.1.0 and P1.1 = VCC or GND3. Lock bits programmedAT89C4051TY

16AT89C40511001D–06/01Ordering InformationSpeed(MHz)PowerSupply Ordering Code Package Operation Range12 2.7V to 6.0V AT89C4051-12PCAT89C4051-12SC20P32

17Packaging InformationAT89C40511001D–06/011.060(26.9).980(24.9)PIN1.280(7.11).240(6.10).090(2.29)MAX.005(.127)MIN.015(.381) MIN.022(.559).014(.356).0

© Atmel Corporation 2001.Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standa

2AT89C40511001D–06/01Block Diagram

3AT89C40511001D–06/01Pin DescriptionVCC Supply voltage.GND Ground.Port 1 Port 1 is an 8-bit bi-directional I/O port. Port pins P1.2 to P1.7 provide in

4AT89C40511001D–06/01Oscillator CharacteristicsXTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier whichcan be configure

5AT89C40511001D–06/01Special Function RegistersA map of the on-chip memory area called the Special Function Register (SFR) space isshown in the table

6AT89C40511001D–06/01Restrictions on Certain InstructionsThe AT89C4051 is an economical and cost-effective member of Atmel’s growing familyof microcon

7AT89C40511001D–06/01Idle Mode In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active.The mode is invoked by softw

8AT89C40511001D–06/01Programming The FlashThe AT89C4051 is shipped with the 4K bytes of on-chip PEROM code memory array inthe erased state (i.e., cont

9AT89C40511001D–06/013. Pulse pin XTAL1 once to advance the internal address counter.4. Read the next code data byte at the port P1 pins.5. Repeat ste