w83627sf Winbond Electronics Corp America, w83627sf Datasheet - Page 92

• Manufacturer Part Number: w83627sf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

8. GENERAL PURPOSE I/O
W83627SF provides 42 input/output ports that can be individually configured to perform a simple basic
I/O function or a pre-defined alternate function. These 42 GP I/O ports are divided into seven groups.
GP1 is configured through control registers in logical device 7, GP2 in logical device 8, GP3 and GP4 in
logical device 9, GP5, GP6, and GP7 in logical device C. Users can configure each individual port to be
an input or output port by programming respective bit in I/O selection register (0 = output, 1 = input).
Invert port value by setting inversion register (0 = non-inverse, 1 = inverse). Port v alue is read/written
through data register. Table 8.1 and 8.2 gives more details on GPIO's assignment. In addition, GP3 and
GP4 are designed to be functional even in power loss condition (VCC is off). Figure 8.1 shows the GP
I/O port's structure.
except ports in GP3 and GP4 which maintain their previous settings until a battery loss condition.
Table 8.1
SELECTION BIT
0 = OUTPUT
1 = INPUT
0
0
1
1
0 = NON INVERSE
INVERSION BIT
Right after Power-on reset, those ports default to perform basic input function
1 = INVERSE
0
1
0
1
Basic non-inverting output
Basic inverting output
Basic non-inverting input
Basic inverting input
BASIC I/O OPERATIONS
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Publication Release Date: Nov. 2000
PRELIMINARY
W83627SF
Revision 0.60