Rainbow-electronics ATAR862-8 User Manual download pdf (Page 51)

ATAR862-8

4589B–4BMCU–02/03

Timer 2 Mode Register 1

(T2M1)

Address: "7"hex - Subaddress: "1"hex

Duty Cycle Generator The duty cycle generator generates duty cycles of 25%, 33% or 50%. The frequency at

the duty cycle generator output depends on the duty cycle and the Timer 2 prescaler

setting. The DCG-stage can also be used as additional programmable prescaler for

Timer 2.

Bit 3Bit 2Bit 1Bit 0

T2D1 T2D0 T2MS1 T2MS0 Reset value: 1111b

T2D1 Timer 2 Duty cycle bit 1

T2D0 Timer 2 Duty cycle bit 0

T2D1 T2D0

Function of Duty Cycle Generator

(DCG) Additional Divider Effect

1 1 Bypassed (DCGO0) /1

1 0 Duty cycle 1/1 (DCGO1) /2

0 1 Duty cycle 1/2 (DCGO2) /3

0 0 Duty cycle 1/3 (DCGO3) /4

T2MS1 Timer 2 Mode Select bit 1

T2MS0 Timer 2 Mode Select bit 0

Mode T2MS1 T2MS0 Clock Output (POUT) Timer 2 Modes

1 1 1 4-bit counter overflow (OVF1) 12-bit compare counter; the

DCG has to be bypassed in

this mode

2 1 0 4-bit compare output (CM1) 8-bit compare counter with 4-

bit programmable prescaler

and duty cycle generator

3 0 1 4-bit compare output (CM1) 8-bit compare counter clocked

by SYSCL or the external clock

input T2I, 4-bit prescaler run,

the counter 2/1 starts after

writing mode 3

4 0 0 4-bit compare output (CM1) 8-bit compare counter clocked

by SYSCL or the external clock

input T2I, 4-bit prescaler stop

and resets

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 105 106

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Rainbow-electronics ATAR862-8 User Manual Page 51