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8051 core: Overview Details Name: 8051 Created: 25-Sep-2001 10:15:02 Updated: 29-Jul-2008 23:57:07 CVS: browse Other project properties Category :: Microprocessor Standard :: Wishbone compliant core Development status :: Alpha Project maintainers Jaka Simsic Simon Teran Statistics view Description The 8051 microcontroller is member of MCS-51 family, originally designed in the 1980's by Intel. The 8051 has gained great popularity since its introduction and is estimated it is used in a large percentage of all embedded system products. The basic form of 8051 core includes several on-chip peripherals, like timers and counters, additionally there are 128 bytes of on-chip data memory and up to 4K bytes of on-chip program memory. Features 8-bit CPU optimized for control applications Exstensive Boolean processing (single-bit logic) capabilities 64K Program Memory address space 64K Data Memory address space up to 64K bytes of on-chip Program Memory (ROM) 128 bytes of on-chip Data RAM 4, 8 bit wide, ports outputs (byte or bit addressable) 4, 8 bit wide, ports inputs (byte or bit addressable) Two 16-bit timer/counters 6-source/5-vector interrupt structure with two priority levels priority levels Status Basic core is now syntesizable. I test it with XESS XSV board. It have all pheripherals. I/O ports rst (in) reset clk (in) clock int0 (in) external interrupt 0 int1 (in) external interrupt 1 ea (in) external access iadr_o (out) program rom addres idat_i (in) input from external rom istb_o (out) strobe to program rom iack_i (in) acknowledge from external rom icyc_o (out) cycle output to external rom dat_i (in) exteranal ram input dat_o (out) exteranal ram output adr_o (out) external address we_o (out) write to external ram stb_o (out) strobe ack_i (in) acknowledge cyc_o (out) cycle p0_in, p1_in, p2_in, p3_in (in) port inputs p0_out, p1_out, p2_out, p3_out (out) port outputs rxd (in) receive txd (out) transmit t0, t1 (in) t/c external inputs interface Modules oc8051_acc: accumulator oc8051_alu: aritmetic logic unit oc8051_alu_src1_sel, oc8051_alu_src2_sel, oc8051_alu_src3_sel: alu source select modules oc8051_b_register: sfr b register oc8051_comp: compare oc8051_cy_select: carry select oc8051_decoder: main module, decodes instruction and creates control signals oc8051_defines oc8051_divide: alu submodule for division oc8051_dptr: data pointer register oc8051_ext_addr_sel: external address select oc8051_immediate_sel: innediate data select oc8051_indi_addr: indirect address select oc8051_int: interrupt handling module oc8051_multiply: alu submodule for multiplection oc8051_op_select: operation select oc8051_pc: program counter oc8051_ports: port inputs and outputs oc8051_psw: program status word oc8051_ram_top: data ram oc8051_ram_rd_sel: select address for reading from ram oc8051_ram_sel: ram output select oc8051_ram_wr_sel: select address for writing to ram oc8051_regX: X wide registers (used to dely signal for 1 clock) oc8051_rom: program rom oc8051_rom_addr_sel: rom address select oc8051_sp: stack pointer oc8051_tc: timer/counter oc8051_timescale oc8051_top: top module oc8051_uart: serial interface design diagram