Hi guys! I've started designing an automatic led backlight. Simple as a transistor with high hfe switching between states. I planned to use some logical state (perhaps power signal on the lcd screen). But I stopped liking my idea when I calculated power consumption, because most of the time the calculator is used with natural light and this will be a huge power waste.
So, my question is: Is any way to control any part of the z80 (ASIC) to switch between logical states and control it with a program? Programing isn't a problem. In fact I'm designing all related to hardware and one friend who knows programming in assembler is ready to do software. I thought I could use the link port, but I've read something about silent checking for transfers so I assume that the port isn't all time low (about 5V) when unused. Main problem is I can't find any hardware info related to the ASIC as it's TI propietary. Another thing I can't know is if it will be possible to keep this logical state running low or high in the background without hanging the cpu and letting me use the calculator.
What do you think about? This is all because I really dislike the idea of cutting case to put a microswitch.
PD: I'm sorry if this is the wrong section to post this. Feel free to move it wherever you consider better
So, my question is: Is any way to control any part of the z80 (ASIC) to switch between logical states and control it with a program? Programing isn't a problem. In fact I'm designing all related to hardware and one friend who knows programming in assembler is ready to do software. I thought I could use the link port, but I've read something about silent checking for transfers so I assume that the port isn't all time low (about 5V) when unused. Main problem is I can't find any hardware info related to the ASIC as it's TI propietary. Another thing I can't know is if it will be possible to keep this logical state running low or high in the background without hanging the cpu and letting me use the calculator.
What do you think about? This is all because I really dislike the idea of cutting case to put a microswitch.
PD: I'm sorry if this is the wrong section to post this. Feel free to move it wherever you consider better
