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SYS_TICK: Use Timer2 instead of Timer0.

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Downside of Timer0 is, we have to manually reload
the timer value. Timer2 can do that automaticly.
This saves a lot of time in the interrupt-handler
of the Timer.

Currently Timer2 is used for baudrate-generation
but in a separete commit this is moved to Timer1.
This commit is contained in:
René van Dorst
2026-01-04 14:14:52 +01:00
parent 52832ff299
commit 8b061d5fb9
3 changed files with 55 additions and 32 deletions
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rtl837x_sfr.h
+12 -5
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@@ -40,11 +40,6 @@ __sfr __at(0x91) EXIF;
__sfr __at(0xf8) EIP;
__sbit __at(0xf9) PX3;
/* SFR control registers for serial communication */
__sfr __at(0xc8) T2CON;
__sfr __at(0xca) RCAP2L;
__sfr __at(0xcb) RCAP2H;
/* SFR Bank control register: 0x0-3f. A value of 0 is bank 1 */
__sfr __at(0x96) PSBANK;
// SFR used to store return bank for trampoline
@@ -101,3 +96,15 @@ __sfr __at(0xb6) SFR_NIC_RING_H;
/* Standard 8051 sfr */
// Timer 0 value
__sfr16 __at(0x8c8a) T0_U16;
// Timer 1 enable interrupt
__sbit __at(0xad) ET2;
// Timer 2
__sfr __at(0xcc) TL2;
__sfr __at(0xcd) TH2;
__sfr16 __at(0xcdcc) T2_U16;
__sfr __at(0xc8) T2CON;
__sfr __at(0xca) RCAP2L;
__sfr __at(0xcb) RCAP2H;
__sfr16 __at(0xcbca) RCAP2_U16;