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AT89LP51RB2 Datasheet(PDF) 79 Page - ATMEL Corporation |
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AT89LP51RB2 Datasheet(HTML) 79 Page - ATMEL Corporation |
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79 / 254 page  79 3722A–MICRO–10/11 AT89LP51RB2/RC2/IC2 Preliminary Table 13-3. TMOD – Timer/Counter Mode Control Register TMOD Address = 089H Reset Value = 0000 0000B Not Bit Addressable GATE1 C/T1 T1M1 T1M0 GATE0 C/T0 T0M0 T0M1 Bit 765 43 210 Symbol Function GATE1 Timer 1 Gating Control When set, Timer/Counter 1 is enabled only while INT1 pin is high and TR1 control pin is set. When cleared, Timer 1 is enabled whenever TR1 control bit is set. C/T1 Timer or Counter Selector 1 Cleared for Timer operation (input from internal system clock). Set for Counter operation (input from T1 input pin). C/T1 must be zero when using Timer 1 in PWM output mode. T1M1 T1M0 Timer 1 Operating Mode Mode T1M1 T1M0 Operation 000 Variable Timer Mode. 8-bit Timer/Counter TH1 with TL1 as 1–8 bit prescaler. Default is 5 bits for a 13-bit timer/counter compatible with AT89C51RB2/RC2/IC2. 101 16-bit Auto-Reload Mode. TH1 and TL1 are cascaded to form a 16-bit Timer/Counter which is reloaded from RH1 and RL1 when it overflows. 210 8-bit Auto-Reload Mode. TH1 holds a value which is reloaded into 8-bit Timer/Counter TL1 each time it overflows. 311 Timer/Counter 1 is stopped GATE0 Timer 0 Gating Control When set, Timer/Counter 0 is enabled only while INT0 pin is high and TR0 control pin is set. When cleared, Timer 0 is enabled whenever TR0 control bit is set. C/T0 Timer or Counter Selector 0 Cleared for Timer operation (input from internal system clock). Set for Counter operation (input from T0 input pin). C/T0 must be zero when using Timer 0 in PWM output mode. T0M1 T0M0 Timer 0 Operating Mode Mode T0M1 T0M0 Operation 000 Variable Timer Mode. 8-bit Timer/Counter TH0 with TL0 as 1–8 bit prescaler. Default is 5 bits for a 13-bit timer/counter compatible with AT89C51RB2/RC2/IC2. 101 16-bit Auto-Reload Mode. TH0 and TL0 are cascaded to form a 16-bit Timer/Counter which is reloaded from RH0 and RL0 when it overflows. 210 8-bit Auto-Reload Mode. TH0 holds a value which is reloaded into 8-bit Timer/Counter TL0 each time it overflows. 311 Split Timer Mode. TL0 is an 8-bit Timer/Counter controlled by the standard Timer 0 control bits. TH0 is only an 8-bit timer controlled by Timer 1 control bits. |
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