參數(shù)資料
型號: ST7267C8T1/XXX
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 30 MHz, RISC MICROCONTROLLER, PQFP48
封裝: 7 X 7 MM, LEAD FREE, TQFP-48
文件頁數(shù): 28/189頁
文件大?。?/td> 1643K
代理商: ST7267C8T1/XXX
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁當(dāng)前第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁
ST7267C8 ST7267R8
123/189
15 MSCI I/O CONTROLLER
15.1 Introduction
The MSCI I/O ports can be configured in different
functional modes:
- data transfer through digital inputs and outputs
and for specific pins:
- alternate input/output signals for the parallel in-
terface.
Each of the two I/O ports contains 16 pins. Each
pin can be programmed independently as digital
input or digital output.
15.2 Functional Description
Each port has 3 main registers:
- Data Register Out (DRO)
- Data Register Input (DRI)
- Data Direction Register (DDR)
Each I/O pin may be programmed using the corre-
sponding register bits in the DDR register: bit X
corresponding to pin X of the port. The same cor-
respondence is used for the DRO and DRI regis-
ters.
The DRO and DDR registers can be read and writ-
ten by the MSCI core. The DRI register is an im-
age corresponding to the logic level on the I/OO
pin and can be read by the MSCI core (read only
register).
The MSCI I/O control block diagram is shown in
15.2.1 Input mode
The input configuration is selected by clearing the
corresponding DDR register bit. In this case, read-
ing the DRI register returns the digital value ap-
plied to the external I/O pin.
In this mode writing the DRO register has no effect
on the pad. However the values are written in the
DRO register and if the DDR register is set to out-
put mode, the value on the port will be the value
written previously in the DRO register.
15.2.2 Output mode
The output configuration is selected by setting the
corresponding DDR register bit. In this case, writ-
ing the DRO register applies this digital value to
the I/O pin through the latch.
In this mode reading the DRI register returns the
digital value applied to the external I/O pin.
15.2.3 Alternate functions
When an on-chip peripheral is configured to use a
pin in output mode, the alternate function is auto-
matically selected. This alternate function takes
priority over the standard I/O programming.
When the signal is coming from the parallel inter-
face, the I/O pin is automatically configured in out-
put mode when needed. There are two cases de-
pending of the type of signal:
- Control signals are configured using the CS bit in
the PCR2 register.
- Data signals are configured when the DIR bit in
the PCR1 register is set in output mode and data
transmission is on going.
When the signal is going to the parallel interface
(input mode), the I/O pin has to be configured in in-
put mode by the standard I/O programming to
avoid conflicts.
Figure 51. I/O Port General Block Diagram (When I/Os are dedicated to MSCI)
DRO
DDR
DA
TA
B
U
S
VDD
ALTERNATE
OUTPUT
1
0
DDR SEL
DRI SEL
PULL-UP
CONDITION
P-BUFFER
N-BUFFER
VDD
CMOS
SCHMITT
TRIGGER
DRO SEL
ALTERNATE
ENABLE
PAD
I/O
MSCI I/O Controller
MSCI CLOCK
1
0
VDD
相關(guān)PDF資料
PDF描述
ST72774S9T1/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
ST72E734J6D0 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP42
ST72T774S9T1 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
ST7294C6B6 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP28
ST72T94C6M6 8-BIT, OTPROM, MICROCONTROLLER, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72681/R12 制造商:STMicroelectronics 功能描述:CONTROLLER FOR HIGH-PERFORMANCE BUS-POWERED USB 2.0 FLASH DR - Trays
ST72681/S13 制造商:STMicroelectronics 功能描述:CONTROLLER FOR HIGH-PERFORMANCE - Trays
ST7271 制造商:Panasonic Industrial Company 功能描述:IC
ST7271N5B1-CLF 制造商:STMicroelectronics 功能描述:
ST727X4-EMU2B 制造商:STMicroelectronics 功能描述:REALTIME EMULATOR BOARD - Bulk