ADLINK PCI-8554 - Manual (Page 38)

28 • Registers
There are a total of twenty-two bits on the cPCI/PCI-8554/R used for
selecting clock sources for Timer/Counter 1 ~ 10, CK1 and the debounce
system.
Address: BASE + 0x10 ~ 0x12
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
Base+0x10 C4N2 C4N1 C3N2 C3N1 C2N2 C2N1 C1N2 C1N1
Base+0x11 C8N2 C8N1 C7N2 C7N1 C6N2 C6N1 C5N2 C5N1
Base+0x12 - DBCSEL - CK1SEL C10N2 C10N1 C9N2 C9N1
Table 6. Timer/Counter Clock Mode Control Register
CnN1and CnN2: These two bits are used to control clock source of
Timer/Counter n, n = 1 ~ 10
CK1SEL: select source of CK1
DBCSEL: select debounce clock
3.5 Digital Input Register
There are 8 digital input channels on the cPCI/PCI-8554/R.
Address: BASE + 0x18
Attribute: read only
Data Format:
Bit 7 6 5 4 3 2 1 0
Base+0x18 DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
Table 7. Digital Input Register