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UPD780138 Datasheet(PDF) 58 Page - NEC |
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UPD780138 Datasheet(HTML) 58 Page - NEC |
58 / 558 page CHAPTER 3 CPU ARCHITECTURE User’s Manual U16228EJ2V0UD 58 3.1.1 Internal program memory space The internal program memory space stores the program and table data. Normally, it is addressed with the program counter (PC). 78K0/KE1 products incorporate internal ROM (mask ROM or flash memory), as shown below. Table 3-2. Internal ROM Capacity Internal ROM Part Number Structure Capacity µPD780131 8192 × 8 bits (0000H to 1FFFH) µPD780132 16384 × 8 bits (0000H to 3FFFH) µPD780133 24576 × 8 bits (0000H to 5FFFH) µPD780134 Mask ROM µPD78F0134 Flash memory 32768 × 8 bits (0000H to 7FFFH) µPD780136 49152 × 8 bits (0000H to BFFFH) µPD780138 Mask ROM µPD78F0138 Flash memory 61440 × 8 bits (0000H to EFFFH) The internal program memory space is divided into the following areas. (1) Vector table area The 64-byte area 0000H to 003FH is reserved as a vector table area. The program start addresses for branch upon reset signal input or generation of each interrupt request are stored in the vector table area. Of the 16-bit address, the lower 8 bits are stored at even addresses and the higher 8 bits are stored at odd addresses. Table 3-3. Vector Table Vector Table Address Interrupt Source Vector Table Address Interrupt Source 001EH INTTM50 0000H RESET input, POC, LVI, clock monitor, WDT 0020H INTTM000 0004H INTLVI 0022H INTTM010 0006H INTP0 0024H INTAD 0008H INTP1 0026H INTSR0 000AH INTP2 0028H INTWTI 000CH INTP3 002AH INTTM51 000EH INTP4 002CH INTKR 0010H INTP5 002EH INTWT 0012H INTSRE6 0030H INTP6 0014H INTSR6 0032H INTP7 0016H INTST6 0034H INTDMU 0018H INTCSI10/INTST0 0036H INTCSI11 Note 001AH INTTMH1 0038H INTTM001 Note 001CH INTTMH0 003AH INTTM011 Note Note Available only in the µPD780133, 780134, 78F0134, 780136, 780138, and 78F0138. (2) CALLT instruction table area The 64-byte area 0040H to 007FH can store the subroutine entry address of a 1-byte call instruction (CALLT). (3) CALLF instruction entry area The area 0800H to 0FFFH can perform a direct subroutine call with a 2-byte call instruction (CALLF). |
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