ST72321BKX datasheet(76/187 Pages) STMICROELECTRONICS

76 / 187 page

ST72321BRx, ST72321BARx ST72321BJx, ST72321BKx

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16-BIT TIMER (Cont’d)

Notes:

1. After a processor write cycle to the OCiHR reg-

ister, the output compare function is inhibited

until the OCiLR register is also written.

2. If the OCiE bit is not set, the OCMPi pin is a

general I/O port and the OLVLi bit will not

appear when a match is found but an interrupt

could be generated if the OCIE bit is set.

3. In both internal and external clock modes,

OCFi and OCMPi are set while the counter

value equals the OCiR register value (see Fig-

ure 8 for an example with fCPU/2 and Figure 9

for an example with fCPU/4). This behavior is

the same in OPM or PWM mode.

4. The output compare functions can be used both

for generating external events on the OCMPi

pins even if the input capture mode is also

used.

5. The value in the 16-bit OCiR register and the

OLVi bit should be changed after each suc-

cessful comparison in order to control an output

waveform or establish a new elapsed timeout.

Forced Compare Output capability

When the FOLVi bit is set by software, the OLVLi

bit is copied to the OCMPi pin. The OLVi bit has to

be toggled in order to toggle the OCMPi pin when

it is enabled (OCiE bit = 1). The OCFi bit is then

not set by hardware, and thus no interrupt request

is generated.

The FOLVLi bits have no effect in both One Pulse

mode and PWM mode.

Figure 49. Output Compare Block Diagram

OUTPUT COMPARE

16-bit

CIRCUIT

OC1R Register

16 BIT

FREE RUNNING

COUNTER

OC1E

CC0

CC1

OC2E

OLVL1

OLVL2

OCIE

(Control Register 1) CR1

(Control Register 2) CR2

OCF2

OCF1

(Status Register) SR

16-bit

OCMP1

OCMP2

Latch

OC2R Register

FOLV2 FOLV1

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