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AT90S8515-4AC Datasheet(PDF) 36 Page - ATMEL Corporation |
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AT90S8515-4AC Datasheet(HTML) 36 Page - ATMEL Corporation |
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36 / 112 page  36 AT90S8515 0841G–09/01 Timer/Counter1 Control Register A – TCCR1A • Bits 7, 6 – COM1A1, COM1A0: Compare Output Mode1A, Bits 1 and 0 The COM1A1 and COM1A0 control bits determine any output pin action following a compare match in Timer/Counter1. Any output pin actions affect pin OC1A (Output Com par eA p i n 1) . T h is is an a l te r n ati v e fun c t i on to an I/ O por t and th e corresponding direction control bit must be set (one) to control the output pin. The con- trol configuration is shown in Table 8. • Bits 5, 4 – COM1B1, COM1B0: Compare Output Mode1B, Bits 1 and 0 The COM1B1 and COM1B0 control bits determine any output pin action following a compare match in Timer/Counter1. Any output pin actions affect pin OC1B (Output CompareB). The control configuration is given in Table 8. Note: X = A or B In PWM mode, these bits have a different function. Refer to Table 12 on page 40 for a detailed description. • Bits 3..2 – Res: Reserved Bits These bits are reserved bits in the AT90S8515 and always read zero. • Bits 1..0 – PWM11, PWM10: Pulse Width Modulator Select Bits 1 and 0 These bits select PWM operation of Timer/Counter1 as specified in Table 9. This mode is described on page 40. Bit 7 6 5 4 3 2 1 0 $2F ($4F) COM1A1 COM1A0 COM1B1 COM1B0 – – PWM11 PWM10 TCCR1A Read/Write R/W R/W R/W R/W R R R/W R/W Initial Value 0 0 0 0 0 0 0 0 Table 8. Compare 1 Mode Select COM1X1 COM1X0 Description 0 0 Timer/Counter1 disconnected from output pin OC1X 0 1 Toggle the OC1X output line. 1 0 Clear the OC1X output line (to zero). 1 1 Set the OC1X output line (to one). Table 9. PWM Mode Select PWM11 PWM10 Description 0 0 PWM operation of Timer/Counter1 is disabled 0 1 Timer/Counter1 is an 8-bit PWM 1 0 Timer/Counter1 is a 9-bit PWM 1 1 Timer/Counter1 is a 10-bit PWM |
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