The MCU is SPC563M64. After configuration of TLB1 entry 1, the program can not run normally!!! The code is as followed. When i delete TLB entry 1 configuration code, the program can run normally!! Why?:confounded_face: __asm void MMUTLB_init(void) { /*configure TLB entry 1,start from 0x0000 8000,4MB*/ lis r3, 0x1001 /* Select TLB entry 1, define R/W replacment control */ ori r3, r3, 0x0000 /* clear the low 16bits of r3*/ mtMAS0 r3 /* Load MAS0 with 0x1001 0000 for TLB entry 1*/ lis r3, 0xC000 /* Define description context and configuration control: */ ori r3, r3, 0x0600 /* VALID=1, IPROT=1, TID=0, TS=0, TSIZE=0110 (4MB size) */ mtMAS1 r3 /* Load MAS 1 with 0x8000 0600 */ lis r3, 0x0000