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ST72E121 Datasheet(PDF) 51 Page - STMicroelectronics

Part # ST72E121
Description  8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS
PDF  92 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72E121 Datasheet(HTML) 51 Page - STMicroelectronics

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ST72E121 ST72T121
SERIAL COMMUNICATIONS INTERFACE (Cont’d)
Figure 32. SCI Block Diagram
WAKE
UP
UNIT
RECEIVE R
CONTRO L
SR
TRANSMIT
CONTROL
TDRE TC RDRF IDLE
OR
NF
FE
-
SCI
CONTRO L
INTERRUPT
CR1
R8
T8
-
M
WAKE
-
--
Received Data Register (RDR)
Received Shift Register
Read
Transmit Data Register (TDR)
Transmit Shift Register
Write
RDI
TDO
(DATA REGIST ER) DR
TRANSMIT TER
CLOCK
RECEIVER
CLOCK
RECEIVER RATE
TRANS MITTER RATE
BRR
SCP1
fCPU
CONTROL
CONTRO L
SCP0SCT2 SCT1 SCT0 SCR2 SCR1SCR0
/2
/PR
/16
CONVEN TIONAL BAUD RATE GENERATOR
SBK
RWU
RE
TE
ILIE
RIE
TCIE
TIE
CR2
51



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