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TMS77C82 Datasheet(PDF) 11 Page - Texas Instruments |
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TMS77C82 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 73 page TMS370Cx6x 8-BIT MICROCONTROLLER SPNS033C – SEPTEMBER 1995 – REVISED FEBRUARY 1997 11 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 CPU (continued) program counter (PC) The contents of the PC point to the memory location of the next instruction to be executed. The PC consists of two 8-bit registers in the CPU: the program counter high (PCH) and program counter low (PCL). These registers contain the most-significant byte (MSbyte) and least-significant byte (LSbyte) of a 16-bit address. The contents of the reset vector (7FFEh, 7FFFh) are loaded into the program counter during reset. The PCH (MSbyte of the PC) is loaded with the contents of memory location 7FFEh, and the PCL (LSbyte of the PC) is loaded with the contents of memory location 7FFFh. Figure 2 shows this operation using an example value of 6000h as the contents of memory locations 7FFEh and 7FFFh (reset vector). Memory Program Counter 60 00 PCH PCL 60 00 0000h 7FFEh 7FFFh Figure 2. Program Counter After Reset memory map The TMS370Cx6x architecture is based on the Von Neuman architecture, where the program memory and data memory share a common address space. All peripheral input/output is memory mapped in this same common address space. In the expansion mode, external memory peripherals are also memory-mapped into this common address. As shown in Figure 3, the TMS370Cx6x provides a 16 bit-address range to access internal or external RAM, ROM, data EEPROM, EPROM input/output pins, peripheral functions, and system-interrupt vectors. The peripheral file contains all input/output port control, on- and off-chip peripheral status and control, EPROM, EEPROM programming, and system-wide control functions. The peripheral file consists of 256 contiguous addresses located from 1000h to 10FFh. The 256 contiguous addresses are logically divided into 16 peripheral file frames of 16 bytes each. Each on-chip peripheral is assigned to a separate frame through which peripheral control and data information is passed. The TMS370Cx6x has its on-chip peripherals and system control assigned to peripheral file frames 1 through 8, addresses 1010h through 108Fh. |
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