ST72E121J4D0 查看數據表（PDF） - STMicroelectronics
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ST72E121J4D0
STMicroelectronics
ST72E121J4D0 Datasheet PDF : 92 Pages
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ST72E121 ST72T121
I/O PORTS (Cont’d)
4.1.4 Register Description
4.1.4.1 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)
7
0
D7
D6
D5
D4
D3 D2 D1
D0
4.1.4.3 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 3
7
0
O7
O6
O5
O4
O3 O2 O1 O0
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).
4.1.4.2 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)
7
0
DD7 DD6 DD5 DD4 DD3 DD2 DD1 DD0
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
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
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