ST7MC2S6 STMicroelectronics, ST7MC2S6 Datasheet - Page 72
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ST7MC2S6
Manufacturer Part Number
ST7MC2S6
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 ST7MC2S6
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
ON-CHIP PERIPHERALS (Cont’d)
10.2.3 Register Description
CONTROL / STATUS REGISTER (ARTCSR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7 = EXCL External Clock
This bit is set and cleared by software. It selects the
input clock for the 7-bit prescaler.
0: CPU clock.
1: External clock.
Bit 6:4 = CC[2:0] Counter Clock Control
These bits are set and cleared by software. They
determine the prescaler division ratio from f
Bit 3 = TCE Timer Counter Enable
This bit is set and cleared by software. It puts the
timer in the lowest power consumption mode.
0: Counter stopped (prescaler and counter frozen).
1: Counter running.
Bit 2 = FCRL Force Counter Re-Load
This bit is write-only and any attempt to read it will
yield a logical zero. When set, it causes the contents
of ARTARR register to be loaded into the counter,
and the content of the prescaler register to be
cleared in order to initialize the timer before starting
to count.
Bit 1 = OIE Overflow Interrupt Enable
This bit is set and cleared by software. It allows to
enable/disable the interrupt which is generated
when the OVF bit is set.
0: Overflow Interrupt disable.
1: Overflow Interrupt enable.
Bit 0 = OVF Overflow Flag
This bit is set by hardware and cleared by software
reading the ARTCSR register. It indicates the tran-
sition of the counter from FFh to the ARTARR val-
ue
72/309
1
EXCL
f
.
7
f
f
f
INPUT
f
f
f
f
INPUT
INPUT
INPUT
COUNTER
INPUT
INPUT
INPUT
f
INPUT
CC2
/ 128
/ 16
/ 32
/ 64
/ 2
/ 4
/ 8
CC1
With f
62.5 kHz
CC0
500 kHz
250 kHz
125 kHz
INPUT
8 MHz
4 MHz
2 MHz
1 MHz
=8 MHz CC2 CC1 CC0
TCE
FCRL
0
0
0
0
1
1
1
1
OIE
0
0
1
1
0
0
1
1
INPUT
OVF
0
0
1
0
1
0
1
0
1
.
0: New transition not yet reached
1: Transition reached
COUNTER ACCESS REGISTER (ARTCAR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = CA[7:0] Counter Access Data
These bits can be set and cleared either by hard-
ware or by software. The ARTCAR register is used
to read or write the auto-reload counter “on the fly”
(while it is counting).
AUTO-RELOAD REGISTER (ARTARR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = AR[7:0] Counter Auto-Reload Data
These bits are set and cleared by software. They
are used to hold the auto-reload value which is au-
tomatically loaded in the counter when an overflow
occurs. At the same time, the PWM output levels
are changed according to the corresponding OPx
bit in the PWMCR register.
This register has two PWM management func-
tions:
PWM Frequency vs Resolution:
[ 128..191 ]
[ 192..223 ]
[ 224..239 ]
CA7
AR7
ARTARR
– Adjusting the PWM frequency
– Setting the PWM duty cycle resolution
[ 0..127 ]
7
7
value
0
CA6
AR6
Resolution
CA5
AR5
> 7-bit
> 6-bit
> 5-bit
> 4-bit
8-bit
CA4
AR4
~0.244 kHz
~0.488 kHz
~0.977 kHz
~1.953 kHz
~0.244 kHz
CA3
AR3
Min
CA2
AR2
f
PWM
CA1
AR1
31.25 kHz
62.5 kHz
125 kHz
250 kHz
500 kHz
Max
CA0
AR0
0
0
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