參數(shù)資料
型號: HMS81C43XX
廠商: Hynix Semiconductor Inc.
英文描述: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION
中文描述: CMOS單芯片8位單片機電視
文件頁數(shù): 45/100頁
文件大?。?/td> 1943K
代理商: HMS81C43XX
HMS81C43xx / GMS87C4060
45
November 2001 ver 1.2
13. Serial I/O
The Serial I/O circuit is shown in Figure 13-1 .
The Serial I/O circuit consists of the octal counter, SI-
OR(DF
H
), SIOM(DE
H
). The SIOR register stores received
data or data which will be transfered. The SIOM register
controls serial communication mode, speed, start, etc.
The more details about registers are shown Figure 13-2 .
Figure 13-1 Block Diagram of Serial I/O circuit
Control
The HMS81C43xx/GMS87C4060 contains a Synchronous
type Serial I/O module.
1. You have to select serial I/O pins by set the SM1~0.
Note:
Sout pin can handle serial data output or serial data
input. You can input serial data to Sout pin when IOSW bit
is 1. But Sin pin is dedicated serial data input pin.
2. You have to select serial communication clock by set the
SCK1~0.
3. If you want to send data, write it to SIOR. Or not skip
this.
4. Start serial communication by set SIOST(Serial I/O
start, SIOM bit1).
5
. After serial communication is completed, SIOSF bit and
interrupt flag IFSIO will be set.
MUX
SIOM [DE
H
]
SM1
SM0
SCK1 SCK0 SIOST SIOSF
SIOR [DF
H
]
Sout
Sin
Octal counter
Control
Circuit
IFSIO
IOSW
1
0
MUX
PS3
PS4
PS5
Exclk
Sclk
D7
D6
D5
D4
D3
D2
D1
D0
SM1
SM0
Function
Port select
R21
R22
R23
0
0
-
R21
R22
R23
0
1
Send
Sclk
Sout
R23
1
0
Receive
Sclk
R22
Sin
1
1
-
R21
R22
R23
SCK1
SCK0
Selected Clock
Ex: Frequency
(f
ex
=8MHz)
0
0
PS3
1uS
0
1
PS4
2uS
1
0
PS5
4uS
1
1
External clock
User define
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