ST7MC1K2 STMicroelectronics, ST7MC1K2 Datasheet - Page 78
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ST7MC1K2
Manufacturer Part Number
ST7MC1K2
Description
8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC,BRUSHLESS MOTOR CONTROL, 5 TIMERS, SPI, LINSCI(TM)
Manufacturer
STMicroelectronics
Datasheet
1.ST7MC1K4.pdf
(309 pages)
Specifications of ST7MC1K2
Hdflash Endurance
100 cycles, data retention
Clock Sources
crystal/ceramic resonator oscillators and by-pass for external clock, clock security system.
Four Power Saving Modes
Halt, Active-Halt, Wait and Slow
Main Clock Controller With
Real time base, Beep and Clock-out capabilities
Two 16-bit Timers With
2 input captures, 2 output compares, external clock input, PWM and pulse generator modes
8-bit Pwm Auto-reload Timer With
2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector
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ST7MC1xx/ST7MC2xx
16-BIT TIMER (Cont’d)
16-bit read sequence: (from either the Counter
Register or the Alternate Counter Register).
The user must read the MS Byte first, then the LS
Byte value is buffered automatically.
This buffered value remains unchanged until the
16-bit read sequence is completed, even if the
user reads the MS Byte several times.
After a complete reading sequence, if only the
CLR register or ACLR register are read, they re-
turn the LS Byte of the count value at the time of
the read.
Whatever the timer mode used (input capture, out-
put compare, one pulse mode or PWM mode) an
overflow occurs when the counter rolls over from
FFFFh to 0000h then:
– The TOF bit of the SR register is set.
– A timer interrupt is generated if:
If one of these conditions is false, the interrupt re-
mains pending to be issued as soon as they are
both true.
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1
At t0
At t0 +Δt
Beginning of the sequence
Sequence completed
– TOIE bit of the CR1 register is set and
– I bit of the CC register is cleared.
Read
MS Byte
Read
LS Byte
instructions
Other
Returns the buffered
LS Byte value at t0
is buffered
LS Byte
Clearing the overflow interrupt request is done in
two steps:
1. Reading the SR register while the TOF bit is set.
2. An access (read or write) to the CLR register.
Notes: The TOF bit is not cleared by accesses to
ACLR register. The advantage of accessing the
ACLR register rather than the CLR register is that
it allows simultaneous use of the overflow function
and reading the free running counter at random
times (for example, to measure elapsed time) with-
out the risk of clearing the TOF bit erroneously.
The timer is not affected by Wait mode.
In Halt mode, the counter stops counting until the
mode is exited. Counting then resumes from the
previous count (Device awakened by an interrupt)
or from the reset count (Device awakened by a
Reset).
10.3.3.2 External Clock
The external clock (where available) is selected if
CC0=1 and CC1=1 in CR2 register.
The status of the EXEDG bit in the CR2 register
determines the type of level transition on the exter-
nal clock pin EXTCLK that will trigger the free run-
ning counter.
The counter is synchronised with the falling edge
of the internal CPU clock.
A minimum of four falling edges of the CPU clock
must occur between two consecutive active edges
of the external clock; thus the external clock fre-
quency must be less than a quarter of the CPU
clock frequency.
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