參數(shù)資料
型號： GMS87C7216LQ
廠商： Electronic Theatre Controls, Inc.
元件分類： 數(shù)學(xué)處理器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 58/121頁
文件大?。?/td> 1645K
代理商： GMS87C7216LQ
GMS81C7208/7216
54
FEB. 2005 Ver 1.04
15. SERIAL COMMUNICATION
The serial interface is used to transmit/receive 8-bit data serially.
Serial communication block consists of serial I/O data register,
serial I/O mode register, clock selection circuit, octal counter and
control circuit as illustrated in Figure 15-1.Pin R07/SIN, R06/
SOUT and R05/SCLK pins are controlled by the serial mode reg-
ister. The contents of the Serial I/O data register can be written
into or read out by software.
The serial communication is activated by the instruction “SET1
SIOST”. The octal counter is reset to “0” by this instruction, starts
counting at the falling or rising edge (by POL selection) of the
transmit clock (SCLK), and it increments at the every clock. A se-
rial interrupt request flag is set when the eighth transmit clock
signal is input (the serial interface is reset) or when serial commu-
nication is discontinued (the octal counter is reset).
The data in the serial data register can be shifted synchronously
with the transfer clock signal.
Figure 15-1 SCI Control Register
SCK1
SCK0
SCLK/R05 Port
Clock Source
Prescaler Divide Ratio
0
0
SCLK output
Internal clock
÷
4
0
1
SCLK output
Internal clock
÷
16
1
0
SCLK output
Internal clock
Use clock from Timer 0 overflow
1
1
SCLK input
External clock
-
BTCL
7
6
5
4
3
2
1
0
MSB
POL
SIOST
Serial transmission status bit
0: Serial transmission is in progress
1: Serial transmission is completed
Serial transmission clock selection
00: f
XIN
÷
4
01: f
÷
16
10: Timer 0 Overflow
11: External Clock
INITIAL VALUE: 0000_0001
B
ADDRESS: 0FE
H
SIOM
SIOSF
MSB first or LSB first
0: LSB First
1: MSB First
R/W
R/W
R/W
R/W
R/W
R
Serial transmission start bit
Setting this bit starts an Serial transmission.
After one cycle, bit is cleared to “0” by hardware.
SIO1
SIO0
R/W
Serial transmission operation Mode
00: Normal Port(R05,R06,R07)
01: Sending Mode(SCLK,SOUT,R07)
10: Receiving Mode(SCLK,R06,SIN)
11: Sending & Receiving Mode(SCLK,SOUT,SIN)
INITIAL VALUE: Undefined
ADDRESS: 0FF
SIOR
BTCL
7
6
5
4
3
2
1
0
R/W R/W R/W R/W
R/W R/W
R/W
R/W
Sending data during sending Mode
Receiving data during receiving Mode
Selection polarity
0: Data in on rising edge, data out on falling edge
1: Data in on falling edge, data out on rising edge
R/W
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