Rainbow-electronics ATAR862-8 User Manual download pdf (Page 50)

ATAR862-8

4589B–4BMCU–02/03

PWM Mode: Pulse-width modulation output on Timer 2 output pin (T2O)

Figure 49. PWM Modulation

Timer 2 Registers Timer 2 has 6 control registers to configure the timer mode, the time interval, the input

clock and its output function. All registers are indirectly addressed using extended

addressing as described in section "Addressing Peripherals". The alternate functions of

the Ports BP41 or BP42 must be selected with the Port 4 control register P4CR, if one of

the Timer 2 modes require an input at T2I/BP41 or an output at T2O/BP42.

Timer 2 Control Register (T2C) Address: "7"hex - Subaddress: "0"hex

0 0 50 255 1000 255 0 150 255 0 50 255 0 100

T2R

Input clock

Counter 2/2

OVF2

CM2

INT4

T2O

load the next

compare value

T2CO2=150 load load

T1 T2 T3 T1 T2

TTT T

Bit 3Bit 2Bit 1Bit 0

T2CS1 T2CS0 T2TS T2R Reset value: 0000b

T2CS1 Timer 2 Clock Select bit 1

T2CS0 Timer 2 Clock Select bit 0

T2CS1 T2CS0 Input Clock (CL 2/1) of Counter Stage 2/1

0 0 System clock (SYSCL)

0 1 Output signal of Timer 1 (T1OUT)

1 0 Internal shift clock of SSI (SCL)

1 1 Output signal of Timer 3 (TOG3)

T2TS Timer 2 Toggle with Start

T2TS = 0, the output flip-flop of Timer 2 is not toggled with the timer start

T2TS = 1, the output flip-flop of Timer 2 is toggled when the timer is started with

T2R

T2R Timer 2 Run

T2R = 0, Timer 2 stop and reset

T2R = 1, Timer 2 run

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 105 106

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Rainbow-electronics ATAR862-8 User Manual Page 50