ST7MC1K2 STMicroelectronics, ST7MC1K2 Datasheet - Page 112
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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
LINSCI™ SERIAL COMMUNICATION INTERFACE (SCI Mode) (cont’d)
10.5.5.3 Receiver
The SCI can receive data words of either 8 or 9
bits. When the M bit is set, word length is 9 bits
and the MSB is stored in the R8 bit in the SCICR1
register.
Character reception
During a SCI reception, data shifts in least signifi-
cant bit first through the RDI pin. In this mode, the
SCIDR register consists or a buffer (RDR) be-
tween the internal bus and the received shift regis-
ter (see
Procedure
– Select the M bit to define the word length.
– Select the desired baud rate using the SCIBRR
– Set the RE bit, this enables the receiver which
When a character is received:
– The RDRF bit is set. It indicates that the content
– An interrupt is generated if the RIE bit is set and
– The error flags can be set if a frame error, noise
Clearing the RDRF bit is performed by the following
software sequence done by:
1. An access to the SCISR register
2. A read to the SCIDR register.
The RDRF bit must be cleared before the end of the
reception of the next character to avoid an overrun
error.
Idle Line
When an idle line is detected, there is the same
procedure as a data received character plus an in-
terrupt if the ILIE bit is set and the I[|1:0] bits are
cleared in the CCR register.
Overrun Error
An overrun error occurs when a character is re-
ceived when RDRF has not been reset. Data can
not be transferred from the shift register to the
TDR register as long as the RDRF bit is not
cleared.
When an overrun error occurs:
112/309
1
and the SCIERPR registers.
begins searching for a start bit.
of the shift register is transferred to the RDR.
the I[1:0] bits are cleared in the CCR register.
or an overrun error has been detected during re-
ception.
Figure
62).
– The OR bit is set.
– The RDR content will not be lost.
– The shift register will be overwritten.
– An interrupt is generated if the RIE bit is set and
The OR bit is reset by an access to the SCISR reg-
ister followed by a SCIDR register read operation.
Noise Error
Oversampling techniques are used for data recov-
ery by discriminating between valid incoming data
and noise.
When noise is detected in a character:
– The NF bit is set at the rising edge of the RDRF
– Data is transferred from the Shift register to the
– No interrupt is generated. However this bit rises
The NF bit is reset by a SCISR register read oper-
ation followed by a SCIDR register read operation.
Framing Error
A framing error is detected when:
– The stop bit is not recognized on reception at the
– A break is received.
When the framing error is detected:
– the FE bit is set by hardware
– Data is transferred from the Shift register to the
– No interrupt is generated. However this bit rises
The FE bit is reset by a SCISR register read oper-
ation followed by a SCIDR register read operation.
Break Character
– When a break character is received, the SCI
the I[|1:0] bits are cleared in the CCR register.
bit.
SCIDR register.
at the same time as the RDRF bit which itself
generates an interrupt.
expected time, following either a desynchroniza-
tion or excessive noise.
SCIDR register.
at the same time as the RDRF bit which itself
generates an interrupt.
handles it as a framing error. To differentiate a
break character from a framing error, it is neces-
sary to read the SCIDR. If the received value is
00h, it is a break character. Otherwise it is a
framing error.
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