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TMP47C201P Datasheet(PDF) 4 Page - Toshiba Semiconductor |
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TMP47C201P Datasheet(HTML) 4 Page - Toshiba Semiconductor |
4 / 32 page 4/32 TOSHIBA CORPORATION TMP47C101/201 2. Internal CPU Function 2.1 Program Counter (PC) The program counter is a 11-bit binary counter which indicates the address of the program memory storing the next instruc- tion to be executed.Normally, the PC is incremented by the number of bytes of the instruction every time it is fetched. When a branch instruction or a subroutine instruction has been executed or an interrupt has been accepted, the specified val- ues listed in Table 2-1 are set to the PC. The PC is initialized to “0” during reset. Figure 2-1. Configuration of Program Counter The PC can directly address a 2048-byte address space. However, with the short branch, the following points must be considered: • Short branch instruction [BSS a] In [BSS a] instruction execution, when the branch con- dition is satisfied, the value specified in the instruction is set to the lower 6 bits of the PC.That is, [BSS a] becomes the in-page branch instruction. When [BSS a] is stored at the last address of the page, the upper 5 bits of the PC point the next page, so that branch is made to the next page. Table 2-1 Status Change of Program Counter |
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