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P83CL882 Datasheet(PDF) 37 Page - NXP Semiconductors |
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P83CL882 Datasheet(HTML) 37 Page - NXP Semiconductors |
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37 / 88 page  2001 Jun 19 37 Philips Semiconductors Product specification 80C51 Ultra Low Power (ULP) telephony controller P83CL882 6.6 Timer 2 Timer 2 is a 16-bit timer/counter which can operate as either an event timer or an event counter. Timer 2 has three operating modes: capture, auto-reload up/down counting and clock output mode. The modes are selected using T2CON. 6.6.1 TIMER 2SPECIAL FUNCTION REGISTERS Timer 2 has six SFRs that can be read and written by the CPU. These registers are: T2CON, T2MOD, T2H, T2L, T2RCH and T2RCL. Timer 2 register values can be changed by hardware or software. If an update by hardware and software occurs in one of the registers T2H, T2L, T2RCH or T2RCL, the update by software has precedence. Table 47 Timer 2 related SFRs 6.6.1.1 Timer 2 Control Register (T2CON) Table 48 Timer 2 Control Register (SFR address C8H) Table 49 Description of T2CON bits SFR DESCRIPTION SFR ADDRESS RESET VALUE T2CON Timer 2 Control Register C8H 00XX 0000 T2MOD Timer 2 Mode Register C9H XXXX X000 T2L Timer 2 Low byte Count Register CCH 0000 0000 T2H Timer 2 High byte Count Register CDH 0000 0000 T2RCL Timer 2 Low byte Capture/Reload Register CAH 0000 0000 T2RCH Timer 2 High byte Capture/Reload Register CBH 0000 0000 76543210 T2F EXF2 −− EXEN2 TR2 C/T2 CP/RL2 BIT SYMBOL DESCRIPTION 7 T2F Timer 2 overflow flag. Set by a Timer 2 overflow and must be cleared by software. TF2 will not be set when clock out mode is selected. 6 EXF2 Timer 2 external flag. Set on a negative transition on T2EX and bit EXEN2 = 1. In Auto-reload mode it is toggled on an under- or overflow; this bit must be cleared by software. 5 and 4 − These 2 bits are reserved each must be set to logic 0. 3 EXEN2 Timer 2 external enable flag. Set by software only; when set, allows a capture or reload to occur, together with an interrupt, as a result of a negative transition on input T2EX if in Capture mode or Auto-reload mode with DCEN reset. If in Auto-reload mode and DCEN is set, the EXEN2 bit has no influence. In the other modes EXF2 is set and an interrupt is generated on a HIGH-to-LOW transition on the T2EX pin. When EXEN2 is reset, Timer 2 ignores events on pin T2EX in all modes. 2 TR2 START/STOP control for Timer 2. Set by software only; when set, the timer is started; when reset the timer is stopped. If Timer 2 is not enabled (TR2 = 0), the clock to Timer 2 is switched off for power saving. 1C/T2 Timer/counter select for Timer 2. Set by software only; when set the counter function is selected, when reset the timer function is selected. 0 CP/RL2 Capture/Reload flag. Set by software only; selection of mode capture or reload; when set the capture function is selected, when reset the reload function is selected. |
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