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ST62T80B Datasheet(PDF) 41 Page - STMicroelectronics |
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ST62T80B Datasheet(HTML) 41 Page - STMicroelectronics |
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41 / 80 page  41/80 ST62T80B/E80B TIMER (Cont’d) 4.2.1 Timer Operating Modes There are three operating modes, which are se- lected by the TOUT and DOUT bits (see TSCR register). These three modes correspond to the two clocks which can be connected to the 7-bit prescaler (fINT ÷ 12 or TIMER pin signal), and to the output mode. 4.2.1.1 Gated Mode (TOUT = “0”, DOUT = “1”) In this mode the prescaler is decremented by the Timer clock input (fINT ÷ 12), but ONLY when the signal on the TIMER pin is held high (allowing pulse width measurement). This mode is selected by clearing the TOUT bit in the TSCR register to “0” (i.e. as input) and setting the DOUT bit to “1”. 4.2.1.2 Event Counter Mode (TOUT = “0”, DOUT = “0”) In this mode, the TIMER pin is the input clock of the prescaler which is decremented on the rising edge. 4.2.1.3 Output Mode (TOUT = “1”, DOUT = data out) The TIMER pin is connected to the DOUT latch, hence the Timer prescaler is clocked by the pres- caler clock input (fINT ÷ 12). The user can select the desired prescaler division ratio through the PS2, PS1, PS0 bits. When the TCR count reaches 0, it sets the TMZ bit in the TSCR. The TMZ bit can be tested under program control to perform a timer function whenever it goes high. The low-to-high TMZ bit transition is used to latch the DOUT bit of the TSCR and trans- fer it to the TIMER pin. This operating mode allows external signal generation on the TIMER pin. Table 14. Timer Operating Modes 4.2.2 Timer Interrupt When the counter register decrements to zero with the ETI (Enable Timer Interrupt) bit set to one, an interrupt request is generated as described in the Interrupt Chapter. When the counter decrements to zero, the TMZ bit in the TSCR register is set to one. Figure 22. Timer Working Principle TOUT DOUT Timer Pin Timer Function 0 0 Input Event Counter 0 1 Input Gated Input 1 0 Output Output “0” 1 1 Output Output “1” BIT0 BIT1 BIT2 BIT3 BIT6 BIT5 BIT4 CLOCK 7-BIT PRESCALER 8-1 MULTIPLEXER 8-BIT COUNTER BIT0 BIT1 BIT2 BIT3 BIT4 BIT5 BIT6 BIT7 1 02 3 4 56 7 PS0 PS1 PS2 VA00186 41 |
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