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Some matter with my "printf()",what can i do ?

When program running to "printf()",the PC always stop at

C:0X0A2A 3099FD JNB TI(0X98.1),C:0A2A

I try adding some word as following :

ES = 0;   //UART INT is Enable before
TI = 1;
printf("%bd",3);
ES = 1;

So , the program running well.Can you tell why being disable UARTs'INT and Setting TI are necessary? How can i overleap this word ?

Another question,why "printf("%bd",3);" can send unsigned char variable to PC right while "printf("%c",3);" not ? What's different between %bd and %c?