Crack MCU TS87C54X2 Heximal

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The prescaler may be used by either the Timer0 module or the Watchdog Timer, but not both. The prescaler assignment is controlled in software by the control bit, PSA (OPTION<3>) when Crack MCU.

Clearing the PSA bit will assign the prescaler to Timer0. The prescaler is not readable or writable. When the prescaler is assigned to the Timer0 module, prescale values of 1:2, 1:4,…, 1:256 are selectable. Section 7.2 “Prescaler” details the operation of the prescaler if Crack MCU.

A summary of registers associated with the Timer0 module is found in Table 7-1. When an external clock input is used for Timer0, it must meet certain requirements. The external clock requirement is due to internal phase clock (TOSC) synchronization before Crack MCU.

Also, there is a delay in the actual incrementing of Timer0 after synchronization. When no prescaler is used, the external clock input is the same as the prescaler output. The synchronization of an external clock with the internal phase clocks is accomplished by sampling the prescaler output on the Q2 and Q4 cycles of the internal phase clocks (Figure 7-4) after Crack MCU.

Therefore, it is necessary for T0CKI or the comparator output to be high for at least 2 TOSC (and a small RC delay of 2 Tt0H) and low for at least 2 TOSC (and a small RC delay of 2 Tt0H). Refer to the electrical specification of the desired device if Crack MCU.

When a prescaler is used, the external clock input is divided by the asynchronous ripple counter type prescaler, so that the prescaler output is symmetrical when Crack MCU.

For the external clock to meet the sampling requirement, the ripple counter must be taken into account. Therefore, it is necessary for T0CKI or the comparator output to have a period of at least 4 TOSC (and a small RC delay of 4 Tt0H) divided by the prescaler value after Crack MCU.

The only requirement on T0CKI or the comparator output high and low time is that they do not violate the minimum pulse width requirement of Tt0H. Refer to parameters 40, 41 and 42 in the electrical specification of the desired device before Crack MCU.

Since the prescaler output is synchronized with the internal clocks, there is a small delay from the time the external clock edge occurs to the time the Timer0 module is actually incremented. Figure 7-4 shows the delay from the external clock edge to the timer incrementing if Crack MCU.

An 8-bit counter is available as a prescaler for the Timer0 module or as a postscaler for the Watchdog Timer (WDT), respectively (see Figure 9-6). For simplicity, this counter is being referred to as “prescaler” throughout this data sheet.

The PSA and PS<2:0> bits (OPTION<3:0>) determine prescaler assignment and prescale ratio. When assigned to the Timer0 module, all instructions writing to the TMR0 register (e.g., CLRF 1, MOVWF 1, BSF 1,x, etc.) will clear the prescaler when Crack MCU.

When assigned to WDT, a CLRWDT instruction will clear the prescaler along with the WDT. The prescaler is neither readable nor writable. On a Reset, the prescaler contains all ‘0’s before Crack MCU.