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SST89V58RD2-33-C-NJ Datasheet(PDF) 39 Page - Silicon Storage Technology, Inc |
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SST89V58RD2-33-C-NJ Datasheet(HTML) 39 Page - Silicon Storage Technology, Inc |
39 / 81 page Data Sheet FlashFlex51 MCU SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD 39 ©2006 Silicon Storage Technology, Inc. S71255-05-000 5/06 5.3 Programmable Clock-Out A 50% duty cycle clock can be programmed to come out on P1.0. This pin, besides being a regular I/O pin, has two alternate functions. It can be programmed: 1. to input the external clock for Timer/Counter 2, or 2. to output a 50% duty cycle clock ranging from 122 Hz to 8 MHz at a 16 MHz operating frequency (61 Hz to 4 MHz in 12 clock mode). To configure Timer/Counter 2 as a clock generator, bit C/#T2 (in T2CON) must be cleared and bit T20E in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to start the timer. The Clock-Out frequency depends on the oscillator fre- quency and the reload value of Timer 2 capture registers (RCAP2H, RCAP2L) as shown in this equation: Oscillator Frequency n x (65536 - RCAP2H, RCAP2L) n = 2 (in 6 clock mode) 4 (in 12 clock mode) Where (RCAP2H, RCAP2L) = the contents of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. In the Clock-Out mode, Timer 2 roll-overs will not generate an interrupt. This is similar to when it is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate gen- erator and a clock generator simultaneously. Note, how- ever, that the baud-rate and the Clock-Out frequency will not be the same. TABLE 5-2: Timer/Counter 1 Mode Function TMOD Internal Control1 External Control2 Used as Timer 0 13-bit Timer 00H 80H 1 16-bit Timer 10H 90H 2 8-bit Auto-Reload 20H A0H 3 Does not run 30H B0H Used as Counter 0 13-bit Timer 40H C0H 1 16-bit Timer 50H D0H 2 8-bit Auto-Reload 60H E0H 3 Not available - - T5-2.0 1255 1. The Timer is turned ON/OFF by setting/clearing bit TR1 in the software. 2. The Timer is turned ON/OFF by the 1 to 0 transition on INT1# (P3.3) when TR1 = 1 (hardware control). TABLE 5-3: Timer/Counter 2 Mode T2CON Internal Control1 1. Capture/Reload occurs only on timer/counter overflow. External Control2 2. Capture/Reload occurs on timer/counter overflow and a 1 to 0 transition on T2EX (P1.1) pin except when Timer 2 is used in the baud rate generating mode. Used as Timer 16-bit Auto-Reload 00H 08H 16-bit Capture 01H 09H Baud rate generator receive and transmit same baud rate 34H 36H Receive only 24H 26H Transmit only 14H 16H Used as Counter 16-bit Auto-Reload 02H 0AH 16-bit Capture 03H 0BH T5-3.0 1255 |
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