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GMS81608 数据表(PDF) 28 Page - Hynix Semiconductor |
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GMS81608 数据表(HTML) 28 Page - Hynix Semiconductor |
28 / 79 page R5 and R5DD registers: R5 is a 3-bit bidirectional I/O port (address CAH). R50, R51 and R55 only are physically implemented on this device. R50, R51 have internal pullups which is activated on input but deactivated on output. As input, these pins that are externally pull low will source current (IP2 on the DC characteristics) because of the internal pullups. Caution: Pins R50, R51 are present on 42SDIP, 44PLCC package only, but not on 40DIP . Refer to Pin as - signment. Each pin is individually configurable as input and output through the R5DD register (address CBH). Port Pin Alternate Function R55 BUZ (Square-wave output for Buzzer driving) The control register PMR5 (address D1H) controls the selection alternate function. After reset, this value is "0", port may be used as general I/O ports. To use buzzer function, write "1" to the PMR5. R47 R46 R45 R44 R43 R42 R41 R40 Port 4 Data Register ADDRESS: C8H RESET VALUE: Undefined R47 R46 R45 R44 R43 R42 R41 R40 R4DD ADDRESS: C9H RESET VALUE: 00000000 Direction select 0: Input 1: Output Input/ Output data R4 Port 4 Direction Register T3S T1S EC2S EC0S INT3S INT2S INT1S INT0S PMR4 ADDRESS: D0H RESET VALUE: 00000000 0: R41 1: INT1 0: R47 1: T3O 0: R45 1: EC2 0: R46 1: T1O 0: R44 1: EC0 0: R43 1: INT3 0: R42 1: INT2 0: R40 1: INT0 MSB LSB IEDS ADDRESS: F8H RESET VALUE: 00000000 Edge Selection Register External Interrupt Edge select 00: Reserved 01: Falling (1-to-0 transition) 10: Rising (0-to-1 transition) 11: Both (Rising & Falling) INT3 INT2 INT1 INT0 Port 4 Mode Register - - R55 - - - R51 R50 Port 5 Data Register ADDRESS: CAH RESET VALUE: Undefined - - R55 - - - R51 R50 R5DD ADDRESS: CBH RESET VALUE: --0---00 Direction select 0: Input 1: Output Input/ Output data R5 Port 5 Direction Register - - BUZS - - - - - PMR5 ADDRESS: D1H RESET VALUE: --0----- Port 5 Mode Register 0: R55 1: BUZ (Buzzer Port) GMS81604/08 LG Semicon 24 |
类似零件编号 - GMS81608 |
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类似说明 - GMS81608 |
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