參數(shù)資料
型號: ST72331
廠商: 意法半導(dǎo)體
英文描述: 8-Bit MCU with 8 to 16K ROM/OTP/EPROM, 256 EEPROM, 384 to 512 Bytes RAM, ADC, WDG, SCI, SPI and 2 Timers(8位微控制器(8M))
中文描述: 8位微控制器與8至16K的光碟/雙層/存儲器,256的EEPROM,384字節(jié)RAM為512,藝發(fā)局,水分散粒劑,脊髓損傷,SPI和2計時器(8位微控制器(8米))
文件頁數(shù): 29/98頁
文件大?。?/td> 1123K
代理商: ST72331
29/98
ST72331
I/O PORTS
(Cont’d)
4.1.3 Register Description
4.1.3.1 Data registers
Port A Data Register (PADR)
Port B Data Register (PBDR)
Port C Data Register (PCDR)
Port D Data Register (PDDR)
Port E Data Register (PEDR)
Port F Data Register (PFDR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = D7-D0
Data Register 8 bits.
The DR register has a specific behaviour accord-
ing to the selected input/output configuration. Writ-
ing the DR register is always taken in account
even if the pin is configured as an input. Reading
the DR register returns either the DR register latch
content (pin configured as output) or the digital val-
ue applied to the I/O pin (pin configured as input).
4.1.3.2 Data direction registers
Port A Data Direction Register (PADDR)
Port B Data Direction Register (PBDDR)
Port C Data Direction Register (PCDDR)
Port D Data Direction Register (PDDDR)
Port E Data Direction Register (PEDDR)
Port F Data Direction Register (PFDDR)
Read/Write
Reset Value: 0000 0000 (00h) (input mode)
Bit 7:0 = DD7-DD0
Data Direction Register 8 bits.
The DDR register gives the input/output direction
configuration of the pins. Each bits is set and
cleared by software.
0: Input mode
1: Output mode
4.1.3.3 Option registers
Port A Option Register (PAOR)
Port B Option Register (PBOR)
Port C Option Register (PBOR)
Port D Option Register (PBOR)
Port E Option Register (PBOR)
Port F Option Register (PFOR)
Read/Write
Reset Value: see Register Memory Map
Table 4
Bit 7:0 = O7-O0
Option Register 8 bits.
The OR register allow to distinguish in input mode
if the interrupt capability or the floating configura-
tion is selected.
In output mode it select push-pull or open-drain
capability.
Each bit is set and cleared by software.
Input mode:
0: floating input
1: input pull-up with interrupt
Output mode:
0: open-drain configuration
1: push-pull configuration
7
0
D7
D6
D5
D4
D3
D2
D1
D0
7
0
DD7
DD6
DD5
DD4
DD3
DD2
DD1
DD0
7
0
O7
O6
O5
O4
O3
O2
O1
O0
91
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