diff options
Diffstat (limited to 'hardware.h')
| -rwxr-xr-x[-rw-r--r--] | hardware.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/hardware.h b/hardware.h index 99e7334..56b8782 100644..100755 --- a/hardware.h +++ b/hardware.h @@ -67,11 +67,22 @@ PxOUT_INIT //Init Output data of portx PxDIR_INIT //Init of Portx Data-Direction Reg (Out=1 / Inp=0) PxSEL_INIT //Px-Modules: -PxREN_INIT // Pull up resistor +PxREN_INIT //Pull up resistor PxIE_INIT //Interrupt Enable (0=dis 1=enabled) PxIES_INIT //Interrupt Edge Select (0=pos 1=neg) */ +// NOTES: +// +// * V1P2_CORE_EN_N is initialized as an output high for a reason! +// +// ATX specifies that there can be as much as 20 ms between 5V reaching +// its 95% level and 3.3V doing likewise. U5H1 (ISL6545) is powered by +// 5V and Q5U1, that disables it, has a pull-up 3.3V on its gate. +// ISL6545 can ramp up its output between ~ 10 and 17 ms (and might +// do it even before) after Power On Reset. + + // PORT1 #define P1OUT_INIT (START_SW1_N | RST_SW2_N | V1P2_CORE_EN_N) #define P1DIR_INIT (V1P2_CORE_EN_N) |