Appendix C Digital Input and Output Operation 49
PCM-4822 Digital I/O Interface Specifications
Digital Input
Input channels: 4 bits
Level: TTL compatible
Input Voltage:
High: 2.0V min
Low: 0.8V max
Input Load:
High: 0.05mA max. at 2.7V
Low: 0.4mA max at 0.5V
Register Address: 340H (or 240H) (Read)
Register Format:
BIT
D3
D2
D1
D0
Value
DI3
DI2
DI1
DI0
Digital Output
Output channels: 4 bits
Level: TTL compatible
Output Voltage:
High: Source -0.4mA at 2.4V min
Low: Sink 8mA at 0.5V max
Register Address: 340H (or 240H) (Write)
Register Format:
BIT
D3
D2
D1
D0
Value
DO3
DO2
DO1
DO0
Summary of Contents for PCM-4822
Page 1: ...PCM 4822 486 Based Single Board Computer with Ethernet Interface...
Page 12: ...6 PCM 4822 User s Manual Board layout and dimensions PCM 4822 dimensions...
Page 16: ...10 PCM 4822 User s Manual Locating jumpers J4 J3 J2 J5 J6 J1 J14 J13 J7 J9 J8 J11 J12 J10...
Page 28: ...22 PCM 4822 User s Manual...
Page 35: ...4 Award BIOS Setup This chapter describes how to set BIOS configuration data C H A P T E R...
Page 56: ...50 PCM 4822 User s Manual...