Difference between revisions of "83:Ports:14"
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'''Function:''' Battery status checking | '''Function:''' Battery status checking | ||
| − | This is a read-only port indicating battery status. | + | 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 === | === Read Values === | ||
| − | * | + | * Bit 0: Reads 1 if batteries are high; 0 if they are low. |
| + | * Bits 1 to 7: Mirror of the [[83:Ports:00|link port]]. | ||
| + | |||
| + | == Comments == | ||
| + | * The voltage level at which bit 0 flips depends on [[83:Ports:04|bits 6 and 7 of port 04]]. | ||
| + | * Bit 0 is directly connected to the reset circuit. That means that without [[83:Ports:04|bit 5 of port 04]] set, the calculator will enter the [[83:OS:Hardware Reset|reset state]] when bit 0 goes low. | ||
Latest revision as of 14:06, 28 April 2005
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.
