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W79E633A40FL Datasheet(PDF) 16 Page - Nuvoton Technology Corporation |
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W79E633A40FL Datasheet(HTML) 16 Page - Nuvoton Technology Corporation |
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16 / 117 page  W79E633A/W79L633A - 16 - PORT 0 Bit: 7 6 5 4 3 2 1 0 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 Mnemonic: P0 Address: 80h Port 0 is a bi-directional I/O port after chip is reset. Besides, it has internal pull-up resisters. This port also provides a multiplexed, low-order address/data bus when the W79E(L)633 accesses external memory. STACK POINTER Bit: 7 6 5 4 3 2 1 0 SP.7 SP.6 SP.5 SP.4 SP.3 SP.2 SP.1 SP.0 Mnemonic: SP Address: 81h The Stack Pointer stores the address in Scratchpad RAM where the stack begins. It always points to the top of the stack. DATA POINTER LOW Bit: 7 6 5 4 3 2 1 0 DPL.7 DPL.6 DPL.5 DPL.4 DPL.3 DPL.2 DPL.1 DPL.0 Mnemonic: DPL Address: 82h This is the low byte of the standard-8051/52, 16-bit data pointer. DATA POINTER HIGH Bit: 7 6 5 4 3 2 1 0 DPH.7 DPH.6 DPH.5 DPH.4 DPH.3 DPH.2 DPH.1 DPH.0 Mnemonic: DPH Address: 83h This is the low byte of the standard-8051/52, 16-bit data pointer. POWER CONTROL Bit: 7 6 5 4 3 2 1 0 SMOD SMOD0 - - GF1 GF0 PD IDL Mnemonic: PCON Address: 87h BIT NAME FUNCTION 7 SMOD 1: This bit doubles the serial-port baud rate in modes 1, 2 and 3. 6 SMOD0 0: Disable Framing Error Detection. SCON.7 acts as per the standard 8051/52 function. 1: Enable Framing Error Detection. SCON.7 indicates a Frame Error and acts as the FE flag. 5-4 - Reserved 3 GF1 General-purpose user flag. 2 GF0 General-purpose user flag. 1 PD 1: Go into POWER DOWN mode. In this mode, all clocks and program execution are stopped. 0 IDL 1: Go into IDLE mode. In this mode, the CPU clock stops, so program execution stops too. However, the clock to the serial port, ADC, PWM timer and interrupt blocks does not stop, so these blocks continue operating. TIMER CONTROL Bit: 7 6 5 4 3 2 1 0 TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 |
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