Bitfield / Register Viewer

Inspect a register bit by bit, toggle / set / clear, and emit HEX plus C macros.

Click the cells to set, clear or flip individual bits and watch HEX, BIN, decimal and the two's-complement reading update; name your fields and export C macros.

Width

Value (HEX / BIN / decimal)

Bit grid

bit 31

.. bit 24

bit 23

.. bit 16

bit 15

.. bit 8

bit 7

.. bit 0

Left to right runs from the most significant bit down; click a cell to flip that bit.

HEX

00 00 23 01

BIN

0000 0000 0000 0000 0010 0011 0000 0001

DEC

8961

Signed

8961

The top bit (bit 32) is 0, so as a 32-bit two's-complement value this is non-negative.

Fields

Give a name and a bit range (MSB : LSB); the extracted value shows up as you type.

MSB

LSB

Field value1 (0x1)

C macros

Paste straight into a header; absolute masks are used, so no shift arithmetic is needed.

/* EmbedKit · 32 位寄存器 */
#define RCC_CFGR_VALUE   0x00002301u

/* 字段 */
#define RCC_CFGR_PLLM_Pos   0u
#define RCC_CFGR_PLLM_Msk   0x0000003Fu
#define RCC_CFGR_PLLM_Val   0x00000001u

Notes

All bit twiddling happens locally with BigInt; the width only affects display and truncation.

HEX, BIN and decimal are the unsigned view; the signed row reads it as a 32-bit two's-complement value.

Everything is computed locally in your browser — nothing is uploaded.