| ??? 11/05/12 07:34 Read: times Msg Score: +1 +1 Informative |
#188772 - RE: is there some special "idle mode" wrt the 805x hardware? Responding to: ???'s previous message |
Joseph Hebert said:
is there some special "idle mode" with respect to the 805x hardware? Yes! 80C51 Family Hardware Description, p19, said:
CMOS Power Reduction Mode
CMOS versions have two power reducing modes, Idle and Power Down. The input through which backup power is supplied during these operations is VCC. Figure 23 shows the internal circuitry which implements these features. In the Idle modes (IDL = 1), the oscillator continues to run and the Interrupt, Serial Port, and Timer blocks continue to be clocked, but the clock signal is gated off to the CPU. In Power Down (PD = 1), the oscillator is frozen. The Idle and Power Down Modes are activated by setting bits in Special Function Register PCON. The address of this register is 87H. Figure 24 details its contents. http://www.classic.nxp.com/acrobat_d...WARE_1.pdf Some (many? most?) newer derivatives add further "power reducing modes" - see specific documentation for details... |
| Topic | Author | Date |
| idle mode problem. | 01/01/70 00:00 | |
| Idle Mode? | 01/01/70 00:00 | |
| RE: is there some special "idle mode" wrt the 805x hardware? | 01/01/70 00:00 | |
| Idle modes | 01/01/70 00:00 | |
| RE: couldn't get it into idle mode | 01/01/70 00:00 | |
| re: | 01/01/70 00:00 | |
Check LST and try PD | 01/01/70 00:00 | |
| how do you know? | 01/01/70 00:00 |