AT89LP6440 datasheet(157/194 Pages) ATMEL

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157

3706A–MICRO–9/09

AT89LP6440 - Preliminary

• When using the Internal RC Oscillator during debug, DDA is located on the XTAL1/P4.0 pin.

The P4.0 I/O function cannot be emulated in this mode.

• When using the External Clock during debug, DDA is located on the XTAL2/P4.1 pin and the

system clock drives XTAL1/P4.0. The P4.1 I/O and CLKOUT functions cannot be emulated in

this mode.

• When using the Crystal Oscillator during debug, DDA is located on the P4.3 pin and the

crystal connects to XTAL1/P4.0 and XTAL2/P4.1. The P4.3 I/O function cannot be emulated

in this mode.

25. Programming the Flash Memory

The Atmel AT89LP6440 microcontroller features 64K bytes of on-chip In-System Programmable

Flash program memory and 8K bytes of nonvolatile Flash data memory. In-System Program-

ming allows programming and reprogramming of the microcontroller positioned inside the end

system. Using a simple 4-wire SPI interface, the programmer communicates serially with the

AT89LP6440 microcontroller, reprogramming all nonvolatile memories on the chip. In-System

Programming eliminates the need for physical removal of the chips from the system. This will

save time and money, both during development in the lab, and when updating the software or

parameters in the field. The programming interface of the AT89LP6440 includes the following

features:

•Four-wire serial SPI Programming Interface or 11-pin Parallel Interface

• Active-low Reset Entry into Programming

• Slave Select allows multiple devices on same interface

•User Signature Array

•Flexible Page Programming

•Row Erase Capability

•Page Write with Auto-Erase Commands

•Programming Status Register

For more detailed information on In-System Programming, refer to the Application Note entitled

“AT89LP In-System Programming Specification”.

25.1

Physical Interface

The AT89LP6440 provides a standard programming command set with two physical interfaces:

a bit-serial and a byte-parallel interface. Normal Flash programming utilizes the Serial Peripheral

Interface (SPI) pins of an AT89LP6440 microcontroller. The SPI is a full-duplex synchronous

serial interface consisting of four wires: Serial Clock (SCK), Master-In/Slave-out (MISO), Master-

out/Slave-in (MOSI), and an active-low Slave Select (SS). When programming an AT89LP6440

device, the programmer always operates as the SPI master, and the target system always oper-

ates as the SPI slave. To enter or remain in Programming mode the device’s reset line (RST)

must be held active (low). With the addition of VDD and GND, an AT89LP6440 microcontroller

can be programmed with a minimum of seven connections as shown in Figure 25-1.

AT89LP6440 Datasheet(PDF) 157 Page - ATMEL Corporation

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