W55P241 Datasheet, PDF (2/32 Pages) List of Unclassifed Manufacturers – I/O device usable with many different microprocessors through SPI interface

W55P241
1. GENERAL DESCRIPTION
The W55P241 is a general purpose programmable I/O device usable with many different
microprocessors through SPI interface. The W55P241 contains three 8-bit ports (BP0, BP1 and BP2).
There are 24 I/O pins which may be individually programmed for 4 separate command groups. The
W55P241 features logical operating capability AND/OR/XOR for each bit of internal configuration
register to speed up access. These I/O pins can drive LED directly with high-current applications. A
dedicated counter is in charge of 256-level output functions.
2. FEATURES
 Wide range of operating voltage:
 2.2~5.5V
 SPI interface in mode 0
 4 SPI pins for communication
 /CS as chip select pin (low active)
 CLK for data synchronization (up to 10MHz)
 DI for W55P241 to receive commands and data
 DO for the microcontroller to receive data
 1 wakeup pin for the microcontroller
 24 I/O pins
 24 bi-directional I/O pins with 25mA of sink current
 Status of each pin independently controlled
o Input
 Floating
 Pull high
 Pull low
 Dynamic pull low
 Dynamic pull high
o Output
 CMOS high/low
 Inverted CMOS high/low
 Inverted open-drain NMOS output
 Open-drain PMOS output
 Any pin can be selected to wake up the chip
 Logic AND/OR/XOR to execute high-speed operations for each of these I/O control
register bits
 Built-in 8 LED outputs with 256-level brightness control in the BP0 port
 Internal ring oscillator @ 8MHz
 4 clock sources
o Clock/512, /256, /64, /16
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