汇编不熟悉，但C51 用官方的头文件应该是可以的：
#ifndef __STC89C5xRC_RDP_H_
#define __STC89C5xRC_RDP_H_
/////////////////////////////////////////////////
/* The following is STC additional SFR */
/* sfr AUXR = 0x8e; */
/* sfr AUXR1 = 0xa2; */
/* sfr IPH = 0xb7; */
sfr P4 = 0xe8;
sbit P46 = P4^6;
sbit P45 = P4^5; //ISP下载需勾选"ALE脚用作P4.5口"
sbit P44 = P4^4;
sbit P43 = P4^3;
sbit P42 = P4^2;
sbit P41 = P4^1;
sbit P40 = P4^0;
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