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Some instructions operate internally as read followed by write operations. The BCF and BSF instructions, for example, read the entire port into the CPU, execute the bit operation and rewrite the result.
Caution must be used when these instructions are applied to a port where one or more pins are used as input/outputs. For example, a BSF operation on bit 2 of GPIO will cause all eight bits of GPIO to be read into the CPU, bit 2 to be set and the GPIO value to be written to the output latches.
If another bit of GPIO is used as a bidirectional I/O pin (say bit 0), and it is defined as an input at this time, the input signal present on the pin itself would be read into the CPU and rewritten to the data latch of this particular pin, overwriting the previous content before Break Encrypted Microprocessor TS83C51U2 Eeprom Content.
As long as the pin stays in the Input mode, no problem occurs. However, if bit 0 is switched into Output mode later on, the content of the data latch may now be unknown.
Example 5-1 shows the effect of two sequential Read-Modify-Write instructions (e.g., BCF, BSF, etc.) on an I/O port.
A pin actively outputting a high or a low should not be driven from external devices at the same time in order to change the level on this pin (“wired OR”, “wired AND”). The resulting high output currents may damage the chip.
The actual write to an I/O port happens at the end of an instruction cycle, whereas for reading, the data must be valid at the beginning of the instruction cycle (Figure 5-2) if Break Encrypted Microprocessor TS83C51U2 Eeprom Content.
Therefore, care must be exercised if a write followed by a read operation is carried out on the same I/O port. The sequence of instructions should allow the pin voltage to stabilize (load dependent) before the next instruction causes that file to be read into the CPU.
Otherwise, the previous state of that pin may be read into the CPU rather than the new state. When in doubt, it is better to separate these instructions with a NOP or another instruction not accessing this I/O port.
The Timer0 module has the following features:
8-bit timer/counter register, TMR0
Readable and writable
8-bit software programmable prescaler
Internal or external clock select:
– Edge select for external clock when Break Encrypted Microprocessor TS83C51U2 Eeprom Content
Figure 6-1 is a simplified block diagram of the Timer0 module.
Timer mode is selected by clearing the T0CS bit (OPTION<5>). In Timer mode, the Timer0 module will increment every instruction cycle (without prescaler).
If TMR0 register is written, the increment is inhibited for the following two cycles (Figure 6-2 and Figure 6-3). The user can work around this by writing an adjusted value to the TMR0 register.

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