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W79E227APG Datasheet(PDF) 11 Page - Winbond |
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W79E227APG Datasheet(HTML) 11 Page - Winbond |
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11 / 200 page  Preliminary W79E225A/227A Data Sheet Publication Release Date: December 14, 2007 - 11 - Revision A2.0 PIN DESCRIPTION, continued SYMBOL TYPE INITIAL STATE DESCRIPTIONS P1.0 −P1.7 I/O S H High PORT 1: 8-bit, bi-directional I/O port with internal pull-ups. The ports have alternate functions which are described below: P1.0, ADC0, T2 P1.1, ADC1, BRAKE P1.2, ADC2, RXD1 P1.3, ADC3, TXD1 P1.4, ADC4 P1.5, ADC5 P1.6, ADC6 P1.7, ADC7 P2.0-P2.5 I/O S Tri-state P2.6-P2.7 I/O D High-Z PORT 2: 8-bit, bi-directional I/O port. This port also provides the upper address bits for accesses to external memory. P2.6 to P2.7 can be software configured as I2C serial ports. P2.0 to P2.5 also provides PWM0 to PWM5 outputs. P2.0, A8, PWM0 P2.1, A9, PWM1 P2.2, A10, PWM2 P2.3, A11, PWM3 P2.4, A12, PWM4 P2.5, A13, PWM5 P2.6, A14, SCL P2.7, A15, SDA Note: P2.6 and P2.7 are permanent open drain pins. When access to external memory beyond 16K region, user requires to add external pull-up registers (up to 2Kohm) on these pins. This will result in slight increase in current consumption. P3.0-P3.7 I/O S H High PORT 3: 8-bit, bi-directional I/O port with internal pull-ups. The ports have alternate functions which are described below: P3.0, RXD P3.1, TXD P3.2, /INT0 P3.3, /INT1 P3.4, T0, IC0, QEA P3.5, T1, IC1, QEB P3.6, /WR P3.7, /RD |
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