Specifications

Standard Initialization Sequence for Hercules Microcontrollers

www.ti.com

mov r11, #0x0000

mov r12, #0x0000

; Switch back to Supervisor Mode (M = 0b10011)

cps #0x13

; Initialize Floating Point Unit registers if FPU is used

.if __TI_VFPV3D16_SUPPORT__ = 1

fmdrr d0, r1, r1

fmdrr d1, r1, r1

fmdrr d2, r1, r1

fmdrr d3, r1, r1

fmdrr d4, r1, r1

fmdrr d5, r1, r1

fmdrr d6, r1, r1

fmdrr d7, r1, r1

fmdrr d8, r1, r1

fmdrr d9, r1, r1

fmdrr d10, r1, r1

fmdrr d11, r1, r1

fmdrr d12, r1, r1

fmdrr d13, r1, r1

fmdrr d14, r1, r1

fmdrr d15, r1, r1

.endif

; Initialize CPU call-return stack

bl next1

next1 bl next2

next2 bl next3

next3 bl next4

next4 bx r0

.endasmfunc

The CPU’s call-return stack consists of a 4-entry circular buffer. When the CPU pre-fetch unit (PFU)

detects a taken procedure call instruction, the PFU pushes the return address onto the call-return stack.

The instructions that the PFU recognizes as procedure calls are, in both the ARM and Thumb instruction

sets:

→ BL immediate

→ BLX immediate

→ BLX Rm

Initialization of Hercules™ ARM

Cortex™-R4F Microcontrollers SPNA106– September 2011

Submit Documentation Feedback