83:Ports:14
From WikiTI
Synopsis
Port Number: 14h
Function: Battery status checking
This is a read-only port indicating battery status. It also acts as a mirror of the link port on the rest of the bits.
Read Values
- Bit 0: Reads 1 if batteries are high; 0 if they are low.
- Bits 1 to 7: Mirror of the link port.
Comments
- The voltage level at which bit 0 flips depends on bits 6 and 7 of port 04.
- Bit 0 is directly connected to the reset circuit. That means that without bit 5 of port 04 set, the calculator will enter the reset state when bit 0 goes low.
