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Unlock Microcontroller PIC16LF59 Memory Software
Timer0 operation is controlled through the OPTION_REG register which is a critical part for Unlock Microcontroller PIC16LF59 Memory Software (see Register 2-2). Timer mode is selected by clearing bit T0CS (OPTION_REG<5>). In Timer mode, the Timer0 module will increment every instruction cycle (without prescaler).
If the TMR0 register is written, the increment is inhibited for the following two instruction cycles. The user can work around this by writing an adjusted value to the TMR0 register which is kept the same principle like Clone NXP Microprocessor P87LPC768.
Counter mode is selected by setting bit T0CS (OPTION_REG<5>). In Counter mode, Timer0 will increment either on every rising or falling edge of pin RA4/AN4/T0CKI. The incrementing edge is determined by the Timer0 Source Edge Select bit, T0SE (OPTION_REG<4>). Clearing bit T0SE selects the rising edge.
Restrictions on the external clock input are discussed in detail in Section 6.3 “Using Timer0 with an External Clock” refers to Break IC. The prescaler is mutually exclusively shared between the Timer0 module and the Watchdog Timer. The prescaler is not readable or writable. Section 6.4 “Prescaler” details the operation of the prescaler.
The TMR0 interrupt is generated when the TMR0 register overflows from FFh to 00h. This overflow sets bit, TMR0IF (INTCON<2>). The interrupt can be masked by clearing bit for Microchip Microcomputer PIC18F243 cloning TMR0IE (INTCON<5>). Bit TMR0IF must be cleared in software by the Timer0 module Interrupt Service Routine before re-enabling this interrupt and proceed with Unlock Microcontroller PIC16LF59 Memory Software. The TMR0 interrupt cannot awaken the processor from Sleep since the timer is shut-off during Sleep.
When no prescaler is used, the external clock input is the same as the prescaler output. The synchronization of T0CKI with the internal phase clocks is accomplished by sampling the prescaler output on the Q2 and Q4 cycles of the internal phase clocks. Therefore, it is necessary for T0CKI to be high for at least 2 TOSC (and a small RC delay of 20 ns) and low for at least 2 TOSC (and a small RC delay of 20 ns). Refer to the electrical specification of the desired device in Crack PIC16C58A MCU.