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TPIC82010FFER Datasheet(PDF) 29 Page - Texas Instruments |
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TPIC82010FFER Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 92 page  TPIC82000 Series www.ti.com SLDS189 – MAY 2012 Description Label Address Reset Value Bit Addressable Interrupt Enable Register 1(1) IE1 0xE8 0x00 O B Register B 0xF0 0x00 O Interrupt Priority Register 1(1) IP1 0xF8 0x00 O 3.2.7.2 I/O PORT (P0,P1,P2,P3) On the 8051 MCU, P0, P1, P2 and P3 are assigned as the 32 quasi-bi-directional I/O lines. However, on the TPIC82000 device, only the ports P3<1:0> can be used for a general purpose I/O (GPIO), the others are not configured or usable. ■M I/O PORTS(P0,P1,P2,P3)(1) Bit Addressable ESFR: 0xB0 P3 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 – – – – – – P3<1> P3<0> Access r/w r/w r/w r/w r/w r/w w r At Power on reset 1 1 1 1 1 1 1 1 At Timer reset 1 1 1 1 1 1 1 1 Some of the Port 3 have alternate functions as shown below. BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 – – – – – NINT0 TXD RXD – – – – – input output Input BIT1: TXD output Serial Transmit Data from UART and transmit clock in UART mode 0. BIT0: RXD input Serial Receive Data to UART (1) The functions NINT1, T0 and T1 originally assigned at bit 3, bit 4 and bit 5, respectively, on this extended register (on a standard 8051 core) are not supported or usable on the TPIC82000 device. 3.2.7.3 Stack Pointer (SP) The SP register contains the Stack Pointer. The Stack Pointer is used to load the program counter into internal data memory during LCALL and ACALL instructions and is used to retrieve the program counter from memory during RET and RETI instructions. Data may also be saved on or retrieved from the stack using PUSH and POP instructions. Instructions that use the stack automatically pre-increment or post- decrement the Stack Pointer. Therefore, the Stack Pointer always points to the last byte written to the stack, which is on the top of the stack. On reset, the Stack Pointer is set to 0x07. The programmer should ensure that the location of the stack in the internal data memory does not interfere with other data stored therein. ■M Stack Pointer (SP) Not Bit Addressable ESFR: 0x81 SP BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 SP<7> SP<6> SP<5> SP<4> SP<3> SP<2> SP<1> SP<0> Access r/w r/w r/w r/w r/w r/w r/w r/w At Power on reset 0 0 0 0 0 0 0 0 At Timer reset 0 0 0 0 0 0 0 0 3.2.7.4 Data Pointer (DPTR) The Data Pointer (DPTR) is a 16-bit register that may be accessed via the two SFR locations, Data Pointer High Byte (DPH) and Data Pointer Low Byte (DPL). Two true 16-bit operations are allowed on the Data Pointer: load immediate and increment. The Data Pointer is used to form 16-bit addresses for the External Data Memory Accesses (MOVX), for program byte moves (MOVC) and for indirect program jumps (JMP @A+DPTR). On reset, the Data Pointer is set to 0x0000. Copyright © 2012, Texas Instruments Incorporated FUNCTION DESCRIPTION 29 Submit Documentation Feedback Product Folder Link(s): TPIC82000 Series |
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