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GMS90C320PL40 Arkusz danych(PDF) 21 Page - Hynix Semiconductor

Numer części GMS90C320PL40
Szczegółowy opis  HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS
PDF  46 Pages
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Producent  HYNIX [Hynix Semiconductor]
Strona internetowa  http://www.skhynix.com/kor/main.do
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GMS90C320PL40 Arkusz danych(HTML) 21 Page - Hynix Semiconductor

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GMS90C320
OCT. 2000 Ver 1.2
17
Serial Interface (USART)
The serial port is full duplex and can operate in four modes (one synchronous mode, three asynchronous modes) as illustrated
in Table 6. The possible baud rates can be calculated using the formulas given in Table 7.
Table 6
USART Operating Modes
Mode
SCON
Baudrate
Description
SM0
SM1
0
0
0
Serial data enters and exits through RxD.
TxD outputs the shift clock.
8-bit are transmitted/received (LSB first)
1
0
1
Timer 1/2 overflow rate
8-bit UART
10 bits are transmitted (through TxD) or
received (RxD)
2
10
or
9-bit UART
11 bits are transmitted (through TxD) or
received (RxD)
3
1
1
Timer 1/2 overflow rate
9-bit UART
Like mode 2 except the variable baud rate
Table 7
Formulas for Calculating Baud rates
Baud Rate
derived from
Interface Mode
Baud rate
Oscillator
0
2
Timer 1 (16-bit timer)
(8-bit timer with 8-bit autore-
load)
1, 3
1, 3
Timer 2
1, 3
ƒ
OSC
12
----------------
ƒ
OSC
32
----------------
ƒ
OSC
64
----------------
ƒ
OSC
12
----------------
2SMOD
ƒ
OSC
×
64
------------------------------------------
2SMOD
timer 1 overflow rate
×
32
---------------------------------------------------------------------------------
2SMOD
ƒ
OSC
×
32
12
256
TH1
–
()
×
×
-----------------------------------------------------------
ƒ
OSC
32
65536
RC2H,RC2L
()
–
[]
×
------------------------------------------------------------------------------



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