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Bt878 GPIO PIN Definition
Table 6-1: Bt878 GPIO PIN Definition
Pin Type Function
GPIO0 Output --
GPIO1 Output
Set watchdog timer enable / disable
Set “1” => disable (default),
set ”0” => enable
GPIO2 Output
Control the watch dog timer count down time
GPIO3 Output
GPIO4 Input Card ID bit 0 (setting by dip switch)
GPIO5 Input Card ID bit 1 (setting by dip switch)
GPIO6 Input Card ID bit 2 (setting by dip switch)
GPIO7 Input --
GPIO8 Input Port 1 DI
GPIO9 Input Port 2 DI
GPIO10 Input Port 3 DI
GPIO11 Input Port 4 DI
GPIO12 Output Port 1 DO
GPIO13 Output Port 2 DO
GPIO14 Output Port 3 DO
GPIO15 Output Port 4 DO
GPIO16 Output
Monitor single channel , data enable (low
active) (E#)
GPIO17 Output Monitor single channel , data 0 (S0)
GPIO18 Output Monitor single channel , data 1 (S1)
GPIO19 Output Monitor single channel , data 2 (S2)