ST72260GX datasheet(62/172 Pages) STMICROELECTRONICS

Part #	ST72260GX

Description	8-BIT MCU WITH FLASH OR ROM MEMORY, ADC, TWO 16-BIT TIMERS, I2C, SPI, SCI INTERFACES

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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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. When the timer clock is fCPU/2, OCFi and

OCMPi are set while the counter value equals

the OCiR register value (see Figure 42 on page

63). This behaviour is the same in OPM or

PWM mode.

When the timer clock is fCPU/4, fCPU/8 or in

external clock mode, OCFi and OCMPi are set

while the counter value equals the OCiR regis-

ter value plus 1 (see Figure 43 on page 63).

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.

FOLVLi bits have no effect in both one pulse mode

and PWM mode.

Figure 41. 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

0

OCF2

OCF1

(Status Register) SR

16-bit

OCMP1

OCMP2

Latch

1

Latch

2

OC2R Register

FOLV2 FOLV1

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