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Both ISP and ICSP are methods of in-system/circuit programming of a microcontroller flash/eeprom memory, typically utilizing a hardware programmer like the JTAGICE mkII for Atmel devices (ISP) or the PICkit 2/3 or ICD2/3 for Microchip devices (ICSP).
In Application Programming (IAP) refers to the currently loaded code having the ability to reprogram sections of the microcontrollers flash during runtime.
IAP is often used by resident bootloaders to load new code/applications into the microcontrollers flash using only a serial connection like UART or USB.
as you look to ISP and ICSP from working point of view then both are same and get burn flash via serial interface then some of use UART and some of Use clock and data line.
as you look to ISP and ICSP from working point of view then both are same and get burn flash via serial interface then some of use UART and some of Use clock and data line.
For In-System Programming, the programmer is connected to the target using as few
wires as possible. To program any AVR microcontroller in any target system, a simple
Six-wire interface is used to connect the programmer to the target PCB. Figure 1
below shows the connections needed.
The Serial Peripheral Interface (SPI) consists of three wires: Serial ClocK (SCK), Master
In – Slave Out (MISO) and Master Out – Slave In (MOSI). When programming the
AVR, the In-System Programmer always operate as the Master, and the target system
always operate as the Slave.
The In-System Programmer (Master) provides the clock for the communication on the
SCK Line. Each pulse on the SCK Line transfers one bit from the Programmer (Master)
to the Target (Slave) on the Master Out – Slave In (MOSI) line. Simultaneously,
each pulse on the SCK Line transfers one bit from the target (Slave) to the Programmer
(Master) on the Master In – Slave Out (MISO) line.
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