Rainbow-electronics ATAR862-8 User Manual download pdf (Page 64)

ATAR862-8

4589B–4BMCU–02/03

Timer 3 Compare- and

Compare-mode Register

Timer 3 has two separate compare registers T3CO1 and T3CO2 for the 8-bit stage of

Timer 3. The timer compares the content of the compare register with the current

counter value. If both match, it generates a signal. This signal can be used for the

counter reset, to generate a timer interrupt, for toggling the output flip-flop, as SSI clock

or as clock for the next counter stage. For each compare register, a compare-mode reg-

ister exists. These registers contain mask bits to enable or disable the generation of an

interrupt, a counter reset, or an output toggling with the occurrence of a compare match

of the corresponding compare register. The mask bits for activating the single-action

mode can also be located in the compare mode registers. When assigned to the com-

pare register a compare event will be suppressed.

Timer 3 Compare-Mode

Address: "B"hex - Subaddress: "2"hex

T3CM1 contains the mask bits for the match event of the Counter 3 compare register 1

T3CS1 Timer 3 Clock Source select bit 1 T3CS1 TCS0 Counter 3 Input Signal (CL3)

T3CS0 Timer 3 Clock Source select bit 0 1 1 System clock (SYSCL)

1 0 Output signal of Timer 2 (POUT)

0 1 Output signal of Timer 1 (T1OUT)

0 0 External input signal from T3I edge

detect

Bit 3Bit 2Bit 1Bit 0

T3CM1 T3SM1 T3TM1 T3RM1 T3IM1 Reset value: 0000b

T3SM1 Timer 3 Single action Mask bit 1

T3SM1 = 0, disables single-action compare mode

T3SM1 = 1, enables single-compare mode. After this bit is set, the compare

T3TM1 Timer 3 compare Toggle action Mask bit 1

T3TM1 = 0, disables compare toggle

T3TM1 = 1, enables compare toggle. A match of Counter 3 with the compare

T3RM1 Timer 3 Reset Mask bit 1

T3RM1 = 0, disables counter reset

T3RM1 = 1, enables counter reset. A match of Counter 3 with the compare

T3IM1 Timer 3 Interrupt Mask bit 1

T3RM1 = 0, disables Timer 3 interrupt for T3CO1 register.

T3RM1 = 1, enables Timer 3 interrupt for T3CO1 register.

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Rainbow-electronics ATAR862-8 User Manual Page 64