3.3.2 Special Function Registers Bits Description .......................................................48
3.3.3 Dual Data Pointer Register (DPTR) ....................................................................51
Chapter 4. Configurable I/O Ports of STC90xx series ............53
4.1 I/O Ports Configurations ......................................................................53
4.2 I/O ports Modes....................................................................................54
4.2.1 Quasi-bidirectional I/O........................................................................................54
4.2.2 Open-drain Output (P0 ports are defaut to this mode after reset)........................55
4.3 I/O port application notes.....................................................................55
4.4 Head File/New SFRs Declarations, P4 of STC90C51RC/RD+ series.56
4.5 P4.5/ALE pin of STC90C51RC/RD+ series 90C version....................58
4.6 Typical transistor control circuit...........................................................59
4.7 3V/5V hybrid system............................................................................59
4.8 I/O drive LED application circuit.........................................................60
4.9 I/O immediately drive LCD application circuit....................................61
Chapter 5. Instruction System...................................................62
5.1 Addressing Modes ................................................................................62
5.2 Instruction Set Summary......................................................................63
5.3 Instruction Definitions..........................................................................67
Chapter 6. Interrupt System....................................................104
6.1 Interrupt Structure ..............................................................................106
6.2 Interrupt Register................................................................................108
6.3 Interrupt Priorities ..............................................................................115
6.4 How Interrupts Are Handled ..............................................................116
6.5 External Interrupts.............................................................................117
6.6 Response Time ..................................................................................121
6.7 Demo Programs about Interrupts (C and Assembly Programs) .........122
6.7.1 External Interrupt 0 (
6.7.2 External Interrupt 1 (
6.7.2 External Interrupt 2 (
6.7.2 External Interrupt 3 (
) Demo Programs (C and ASM).............................122
) Demo Programs (C and ASM).............................126
) Demo Programs (C and ASM).............................130
) Demo Programs (C and ASM).............................135
INT0
INT1
INT2
INT3
Chapter 7. Timer/Counter........................................................140
7.1 Timer/Counter 0/1 ..............................................................................140
7.1.1 Special Function Registers about Timer/Counter 0/1........................................141
Operational Mode (Compatible with traditional 8051 MCU)........ 143
7.1.2 Timer/Counter 0
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