看门狗问题求助

本人使用此单片机，自动启动了看门狗，写的程序无法工作，请大家看下看门狗怎么关狗或喂狗。
以下是是此IC的.H文件
/*--------------------------------------------------------------------------
SM89516A.H
Registers definition for SyncMOS SM89516A
Copyright (c) 2004 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
-------------------------------------------------------------------------- */
/* Byte Addresses */
sfr P0 = 0x80;
sfr SP = 0x81;
sfr DPL = 0x82;
sfr DPH = 0x83;
sfr RCON = 0x85;
sfr DBANK = 0x86;
sfr PCON = 0x87;
sfr TCON = 0x88;
sfr TMOD = 0x89;
sfr TL0 = 0x8A;
sfr TL1 = 0x8B;
sfr TH0 = 0x8C;
sfr TH1 = 0x8D;
sfr P1 = 0x90;
sfr WDTKEY = 0x97;
sfr SCON = 0x98;
sfr SBUF = 0x99;
sfr P1CON = 0x9B;
[color=ound-color:#ff0000]sfr WDTC = 0x9F; //看门狗SFR
sfr P2 = 0xA0;
sfr SPWMC = 0xA3;
sfr SPWMD0 = 0xA4;
sfr SPWMD1 = 0xA5;
sfr SPWMD2 = 0xA6;
sfr SPWMD3 = 0xA7;
sfr IE = 0xA8;
sfr P3 = 0xB0;
sfr IP = 0xB8;
sfr SCONF = 0xBF;
sfr T2CON = 0xC8;
sfr T2MOD = 0xC9;
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sfr TL2 = 0xCC;
sfr TH2 = 0xCD;
sfr PSW = 0xD0;
sfr P4 = 0xD8;
sfr ACC = 0xE0;
sfr B = 0xF0;
/* Bit Addresses */
/* TCON */
sbit IT0 = TCON^0;
sbit IE0 = TCON^1;
sbit IT1 = TCON^2;
sbit IE1 = TCON^3;
sbit TR0 = TCON^4;
sbit TF0 = TCON^5;
sbit TR1 = TCON^6;
sbit TF1 = TCON^7;
/* P1 */
sbit T2 = P1^0;
sbit T2EX = P1^1;
/* SCON */
sbit RI = SCON^0;
sbit TI = SCON^1;
sbit RB8 = SCON^2;
sbit TB8 = SCON^3;
sbit REN = SCON^4;
sbit SM3 = SCON^5;
sbit SM1 = SCON^6;
sbit SM0 = SCON^7;

/* IE */
sbit EX0 = IE^0;
sbit ET0 = IE^1;
sbit EX1 = IE^2;
sbit ET1 = IE^3;
sbit ES = IE^4;
sbit EA = IE^7;

/* IP */
sbit PX0 = IP^0;
sbit PT0 = IP^1;
sbit PX1 = IP^2;
sbit PT1 = IP^3;
sbit PS = IP^4;

/* T2CON */
sbit CP_RL2 = T2CON^0;
sbit C_T2 = T2CON^1;
sbit TR2 = T2CON^2;
sbit EXEN2 = T2CON^3;
sbit TCLK = T2CON^4;
sbit RCLK = T2CON^5;
sbit EXF2 = T2CON^6;
sbit TF2 = T2CON^7;
/* PSW */
sbit P = PSW^0;
sbit OV = PSW^2;
sbit RS0 = PSW^3;
sbit RS1 = PSW^4;
sbit F0 = PSW^5;
sbit AC = PSW^6;
sbit CY = PSW^7;