ST72251 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72251

8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI, I2C AND 2 TIMERS

STMicroelectronics 

ST72251

16-BIT TIMER (Cont’d)

Figure 18. Timer Block Diagram

fCPU

ST7 INTERNAL BUS

MCU-PERIPHERAL INTERFACE

EXTCLK

pin

8 high

EXEDG

8 low

8-bit

buffer

16

1/2

1/4

1/8

CC[1:0]

COUNTER

REGISTER

ALTERNATE

COUNTER

REGISTER

16

88

88

OUTPUT

COMPARE

REGIS TER

1

OUTPUT

COMPARE

REGIS TER

2

TIMER INTERNAL BUS

16 16

88

88

INPUT

CAPTURE

REGIS TER

1

INPUT

CAPTURE

REGIST ER

2

16

16

OVERFLOW

DETECT

CIRCUIT

OUTPUT COMPARE

CIRCUIT

6

EDGE DETECT

CIRCUIT1

EDGE DETECT

CIRCUIT2

ICAP1

pin

ICAP2

pin

ICF1 OCF1 TOF ICF2 OCF2 0 0 0

(Status Register) SR

LATCH1

LATCH2

OCMP1

pin

OCMP2

pin

ICIE OCIE TOIE FOLV2 FOLV1OLVL2 IEDG1 OLVL1

(Control Register 1) CR1

OC1E OC2E OPM PWM CC1 CC0 IEDG2 EXEDG

(Control Register 2) CR2

(See note)

TIMER INTERRUPT

32/100

31

Note: If IC, OC and TO interrupt requests have separate vectors

then the last OR is not present (See device Interrupt Vector Table)

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