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SST89E52RD2-40-I-TQJ Datasheet(PDF) 44 Page - Silicon Storage Technology, Inc |
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SST89E52RD2-40-I-TQJ Datasheet(HTML) 44 Page - Silicon Storage Technology, Inc |
44 / 91 page 44 Preliminary Specifications FlashFlex51 MCU SST89E52RD2 / SST89E54RD2 / SST89E58RD2 / SST89E516RD2 SST89V52RD2 / SST89V54RD2 / SST89V58RD2 / SST89V516RD2 ©2004 Silicon Storage Technology, Inc. S71255-00-000 3/04 5.0 TIMERS/COUNTERS 5.1 Timers The device has three 16-bit registers that can be used as either timers or event counters. The three timers/counters are denoted Timer 0 (T0), Timer 1 (T1), and Timer 2 (T2). Each is designated a pair of 8-bit registers in the SFRs. The pair consists of a most significant (high) byte and least significant (low) byte. The respective registers are TL0, TH0, TL1, TH1, TL2, and TH2. 5.2 Timer Set-up Refer to Table 3-10 for TMOD, TCON, and T2CON regis- ters regarding timers T0, T1, and T2. The following tables provide TMOD values to be used to set up Timers T0, T1, and T2. Except for the baud rate generator mode, the values given for T2CON do not include the setting of the TR2 bit. There- fore, bit TR2 must be set separately to turn the timer on. TABLE 5-1: TIMER/COUNTER 0 Mode Function TMOD Internal Control1 1. The Timer is turned ON/OFF by setting/clearing bit TR0 in the software. External Control2 2. The Timer is turned ON/OFF by the 1 to 0 transition on INT0# (P3.2) when TR0 = 1 (hardware control). Used as Timer 0 13-bit Timer 00H 08H 1 16-bit Timer 01H 09H 2 8-bit Auto-Reload 02H 0AH 3 Two 8-bit Timers 03H 0BH Used as Counter 0 13-bit Timer 04H 0CH 1 16-bit Timer 05H 0DH 2 8-bit Auto-Reload 06H 0EH 3 Two 8-bit Timers 07H 0FH T5-1.0 1255 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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