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PC87306 데이터시트(PDF) 91 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87306
상세설명  PC87306 SuperI/OTM Enhanced Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, Infrared Interface, IEEE 1284 Pa
PDF  110 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87306 데이터시트(HTML) 91 Page - National Semiconductor (TI)

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110 General Purpose Input and Output (GPIO) Ports
The PC87306 supports two identical General Purpose IO
(GPIO) ports See
Figure 11-1
The PC87306 can wake up with both GPIO Ports either en-
abled or disabled according to the CFG1 strap pin GPIO
Port 1 is at offset 0 and GPIO Port 2 is at offset 1 from the
16-bit GPIO Port base address The GPIO port’s base ad-
dress is software configurable GPBA is an 8-bit configura-
tion register that holds address bit A2-9 (bit 0 holds A2) The
other eight bits of the 16-bit GPIO port base address are 0
Upon reset GPBA is initialized to 00011110 thus dictating
base address e 78h)
The GPIO ports have open-drain outputs with internal pull-
ups and TTL inputs The GPIO behave as follows
1 Writes are latched internally A latched 0 drives the pin
low a latched 1 pulls the pin high via the internal pullup
2 Reads return the pins’ values A driven-low pin is always
read as 0 A pulled-up pin is read as either 0 or 1 accord-
ing to the pin voltage as dictated by the pullup or external
active driver (TTL input buffers are used)
Upon reset the write latches are initialized to FFh
A GPIO port must not be enabled at the same address as
another accessible PC87306 register Undefined results will
occur if a GPIO is configured in this way
TLC12379 – 65
FIGURE 11-1 General Purpose IO (GPIO) Ports
91



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