ST72E121 datasheet(41/92 Pages) STMICROELECTRONICS

Part #	ST72E121

Description	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

Download	92 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

41 / 92 page

41/92

ST72E121 ST72T121

16-BIT TIMER (Cont’d)

4.3.3.5 Forced Compare

In this section

i may represent 1 or 2.

The following bits of the CR1 register are used:

When the FOLV

i bit is set by software, the OLVLi

bit is copied to the OCMP

i pin. The OLVi bit has to

be toggled in order to toggle the OCMP

i pin when

it is enabled (OC

iE bit=1). The OCFi bit is then not

set by hardware, and thus no interrupt request is

generated.

FOLVL

i bits have no effect in both one pulse mode

and PWM mode.

4.3.3.6 One Pulse Mode

One Pulse mode enables the generation of a

pulse when an external event occurs. This mode is

selected via the OPM bit in the CR2 register.

The one pulse mode uses the Input Capture1

function and the Output Compare1 function.

Procedure:

To use one pulse mode:

1. Load the OC1R register with the value corre-

sponding to the length of the pulse (see the for-

mula in Section 4.3.3.7).

2. Select the following in the CR1 register:

– Using the OLVL1 bit, select the level to be ap-

plied to the OCMP1 pin after the pulse.

– Using the OLVL2 bit, select the level to be ap-

plied to the OCMP1 pin during the pulse.

– Select the edge of the active transition on the

ICAP1 pin with the IEDG1 bit (the ICAP1 pin

must be configured as floating input).

3. Select the following in the CR2 register:

– Set the OC1E bit, the OCMP1 pin is then ded-

icated to the Output Compare 1 function.

– Set the OPM bit.

– Select the timer clock CC1-CC0 (see Table

14).

Then, on a valid event on the ICAP1 pin, the coun-

ter is initialized to FFFCh and OLVL2 bit is loaded

on the OCMP1 pin, the ICF1 bit is set and the val-

ue FFFDh is loaded in the IC1R register.

When the value of the counter is equal to the value

of the contents of the OC1R register, the OLVL1

bit is output on the OCMP1 pin, (See Figure 30).

Notes:

1. The OCF1 bit cannot be set by hardware in one

pulse mode but the OCF2 bit can generate an

Output Compare interrupt.

2. The ICF1 bit is set when an active edge occurs

and can generate an interrupt if the ICIE bit is

set.

3. When the Pulse Width Modulation (PWM) and

One Pulse Mode (OPM) bits are both set, the

PWM mode is the only active one.

4. If OLVL1=OLVL2 a continuous signal will be

seen on the OCMP1 pin.

5. The ICAP1 pin can not be used to perform input

capture. The ICAP2 pin can be used to perform

input capture (ICF2 can be set and IC2R can be

loaded) but the user must take care that the

counter is reset each time a valid edge occurs

on the ICAP1 pin and ICF1 can also generates

interrupt if ICIE is set.

6. When the one pulse mode is used OC1R is

dedicated to this mode. Nevertheless OC2R

and OCF2 can be used to indicate a period of

time has been elapsed but cannot generate an

output waveform because the level OLVL2 is

dedicated to the one pulse mode.

FOLV2 FOLV1 OLVL2

OLVL1

event occurs

Counter

= OC1R

OCMP1 = OLVL1

When

on ICAP1

One pulse mode cycle

OCMP1 = OLVL2

Counter is reset

to FFFCh

ICF1 bit is set

41

Similar Part No. - ST72E121

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	ST72E121	66Kb / 4P	REAL-TIME DEVELOPMENT TOOLS FOR THE ST7 MCU FAMILY February 2000

More results

Similar Description - ST72E121

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	ST72E311	660Kb / 100P	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS September 1999 Rev. 1.7
	ST72E311	1Mb / 101P	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS
	ST72311	1Mb / 94P	8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS
	ST72E331	1Mb / 107P	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 256 EEPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS
	ST72101	531Kb / 84P	8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS September 1999 Rev. 1.7
	ST72101	885Kb / 85P	8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS
	ST7263	857Kb / 109P	LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C August 2000 Rev. 1.8
	ST72371	636Kb / 94P	8-BIT MCUs WITH 16K ROM/OTP/EPROM,512 BYTES RAM, ADC, DAC (PWM), TIMER, I2C AND SCI
	ST7263B	1Mb / 132P	LOW SPEED USB 8-BIT MCU FAMILY WITH FLASH/ROM, UP TO 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I짼C April 2003 Rev. 1.5
	ST7250	19Kb / 1P	8-BIT MCU FOR CAN WITH 32K ROM, 1K RAM, EEPROM, ADC, WDG, PWM/BRM, 2 TIMERS, SPI AND SCI INTERFACES October 1997 Rev. 1.2

More results

ST72E121 Datasheet(PDF) 41 Page - STMicroelectronics

ST72E121 Datasheet(HTML) 41 Page - STMicroelectronics

Similar Part No. - ST72E121

Similar Description - ST72E121

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Datasheet Download

Link URL