At88sc0204 Reset Software.12 ((TOP))
RF tags are possible to reset many times. As usually tag from one consumable is possible to program to another consumable and tag from one machine model is possible to program to other model. For example, tag from Xerox CC C118 is possible to program for Xerox WC 5225 and so on.
At88sc0204 Reset Software.12
Bootloader[edit source editbeta]Most AVR models can reserve a bootloader region, 256 B to 4 KB, where re-programming code can reside. At reset, the bootloader runs first, and does some user-programmed determination whether to re-program, or jump to the main application. The code can re-program through any interface available, it could read an encrypted binary through an Ethernet adapter like PXE. Atmel has application notes and code pertaining to many bus interfaces.
If the watchdog timer is enabled, every time it counts up to the program end, the microcontroller reset occurs and program execution starts from the first instruction. The point is to prevent this from happening by using a special command. The whole idea is based on the fact that every program is executed in several longer or shorter loops.
If instructions resetting the watchdog timer are set at the appropriate program locations, besides commands being regularly executed, then the operation of the watchdog timer will not affect the program execution.
Brown out is a potentially dangerous state which occurs at the moment the microcontroller is being turned off or when power supply voltage drops to the lowest level due to electric noise. As the microcontroller consists of several circuits which have different operating voltage levels, this can cause its out of control performance. In order to prevent it, the microcontroller usually has a circuit for brown out reset built-in. This circuit immediately resets the whole electronics when the voltage level drops below the lower limit.
Reset pin is usually referred to as Master Clear Reset (MCLR) and serves for external reset of the microcontroller by applying logic zero (0) or one (1) depending on the type of the microcontroller. In case the brown out is not built in the microcontroller, a simple external circuit for brown out reset can be connected to this pin.
Pin 9: RS A logic one on this pin disables the microcontroller and clears the contents of most registers. In other words, the positive voltage on this pin resets the microcontroller. By applying logic zero to this pin, the program starts execution from the beginning.
A value stored in the Stack Pointer points to the first free stack address and permits stack availability. Stack pushes increment the value in the Stack Pointer by 1. Likewise, stack pops decrement its value by 1. Upon any reset and power-on, the value 7 is stored in the Stack Pointer, which means that the space of RAM reserved for the stack starts at this location. If another value is written to this register, the entire Stack is moved to the new memory location.
As mentioned, port bit state affects performance of port pins, i.e. whether they will be configured as inputs or outputs. If a bit is cleared (0), the appropriate pin will be configured as an output, while if it is set (1), the appropriate pin will be configured as an input. Upon reset and power-on, all port bits are set (1), which means that all appropriate pins will be configured as inputs.
Reset occurs when the RS pin is supplied with a positive pulse in duration of at least 2 machine cycles (24 clock cycles of crystal oscillator). After that, the microcontroller generates an internal reset signal which clears all SFRs, except SBUF registers, Stack Pointer and ports (the state of the first two ports is not defined, while FF value is written to the ports configuring all their pins as inputs). Depending on surrounding and purpose of device, the RS pin is usually connected to a power-on reset push button or circuit or to both of them. Figure below illustrates one of the simplest circuit providing safe power-on reset.
In order to exit the Idle mode and make the microcontroller operate normally, it is necessary to enable and execute any interrupt or reset. It will cause the IDL bit to be automatically cleared and the program resumes operation from instruction having set the IDL bit. It is recommended that first three instructions to execute now are NOP instructions. They don't perform any operation but provide some time for the microcontroller to stabilize and prevents undesired changes on the I/O ports.
By setting the PD bit of the PCON register from within the program, the microcontroller is set to Power down mode, thus turning off its internal oscillator and reduces power consumption enormously. The microcontroller can operate using only 2V power supply in power- down mode, while a total power consumption is less than 40uA. The only way to get the microcontroller back to normal mode is by reset.
you can reset original chips of MINOLTA - DEVELOP - OCE - K.MITA - KONICA MINOLTA - OLIVETTI - IMAGISTICS MINOLTA DEVELOP KONICA OLIVETTI IMAGISTICS K.MITA OCE CF1501 Qc1500 Konica 7915 Olivetti Mf15 CF2001 Qc2000 Konica 7920 Olivetti Mf20 CF2002 Qc2001 Konica 8020 D-Color Mf20 CM2020 KM-C 2030 CS 170 CF3102 Qc3101 Konica 8031 D-Color Mf31 CM3120 KM-C 3130 CS 220 Bizhub C350 Qc2235+ D-Color Mf22 CM3520 CS 180 Bizhub C450 ineo+ 450 CS 230 Bizhub C351 CM3530 CM4530
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