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SE370C792JCT Datasheet(PDF) 8 Page - Texas Instruments |
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SE370C792JCT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 55 page TMS370Cx9x 8-BIT MICROCONTROLLER SPNS036B – JANUARY 1996 – REVISED FEBRUARY 1997 8 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 (PC) 60 00 PCH PCL 60 00 0000h 7FFEh 7FFFh Figure 2. Program Counter After Reset memory map The TMS370Cx9x 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. As shown in Figure 3, the TMS370Cx9x provides a memory-mapped RAM, ROM, data EEPROM, EPROM, input/output pins, peripheral functions, and system-interrupt vectors. The peripheral file contains all input/output port control, peripheral status and control, EPROM, EEPROM programming, and system-wide control functions. The peripheral file consists of 256 contiguous addresses located from 1000h to 107Fh and logically divided into seven 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 TMS370Cx9x has its on-chip peripherals and system control assigned to peripheral file frames 1 through 7, addresses 1010h through 107Fh. |
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