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UPD78044F Datasheet(PDF) 78 Page - NEC |
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UPD78044F Datasheet(HTML) 78 Page - NEC |
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78 / 472 page  78 Chapter 3 CPU Architecture User’s Manual U16504EE1V1UD00 3.4.5 Special function register (SFR) addressing The memory-mapped special function register (SFR) is addressed with 8-bit immediate data in an instruction word. This addressing is applied to the 240-byte spaces FF00H to FFCFH and FFE0H to FFFFH. However, the SFR mapped at FF00H to FF1FH can be accessed with short direct addressing. Operand format Figure 3-22: Special-Function Register (SFR) Addressing (a) Description example MOV PM0, A; when selecting PM0 (FE20H) as sfr (b) Illustration Table 3-10: Special-Function Register (SFR) Addressing Identifier Description sfr Special-function register name sfrp 16-bit manipulatable special-function register name (even address only) Operation code 11110110 OP code 00100000 20H (sfr-offset) 15 0 SFR Effective Address 1 111111 87 0 7 OP code sfr-offset 1 |
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