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UPD784021 Datasheet(PDF) 22 Page - NEC |
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UPD784021 Datasheet(HTML) 22 Page - NEC |
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22 / 90 page  22 m m m m mPD784020, 784021 7.2.2 Control Registers (1) Program counter (PC) This register is a 20-bit program counter. The program counter is automatically updated by program execution. Fig. 7-4 Format of Program Counter (PC) (2) Program Status Word (PSW) This register holds the CPU state. The program status word is automatically updated by program execution. Fig. 7-5 Format of Program Status Word (PSW) Note This flag is used to maintain compatibility with the 78K/III series. This flag must be set to 0 when programs for the 78K/III series are being used. (3) Stack pointer (SP) This register is a 24-bit pointer for holding the start address of the stack. The high-order 4 bits must be set to 0. Fig. 7-6 Format of Stack Pointer (SP) 19 0 PC PSWH PSWL PSW 15 14 13 12 UF RBS2 RBS1 RBS0 11 10 9 8 7 654 3 2 1 0 S Z RSSNote AC IE P/V 0 CY 23 20 0 PC 0 0 0 0 |
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