NEC PD75P402 Manuale Utente Scaricare il pdf (Pagina 59)

CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS

(1) Bit handling instructions

Direct addressing of specific address bits (fmem.bit) can be used on all digital input/output ports.

Example To OR P50 and P31 and output the result to P61.

SET1 CY ; CY ← 1

AND1 CY, PORT5.0 ; CY ← CY

∧ P50

OR1 CY, PORT3.1 ; CY ← CY

∨ P31

SKT CY

BR CLRP

SET1 PORT6.1 ; P61 ← 1

CLRP : CLR1 PORT6.1 ; P61 ← 0

(2) 4-bit handling instructions

All 4-bit memory handling instructions can be used, such as MOV, XCH, ADDS and INCS, in addition to the IN/

OUT instructions.

Example 1. To output accumulator contents to port 3.

OUT PORT3, A

2. To add the accumulator value to the data output to port 5, and output the result.

MOV HL, #PORT5

ADDS A, @HL ; A ← A + PORT5

NOP

MOV @HL, A ; PORT5 ← A

Table 5-2 List of Input/Output Pin Handling Instructions

………

PORT 0 PORT 1 PORT2 PORT 3 PORT5 PORT 6

IN A, PORTn ●●

OUT PORTn, A – – ●●

SET1 PORTn.bit – – ●●

CLR1 PORTn.bit – – ●●

SKT PORTn.bit ●●

SKF PORTn.bit ●●

AND1 CY, PORTn.bit ●●

OR1 CY, PORTn.bit ●●

XOR1 CY, PORTn.bit ●●

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 194 195

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NEC PD75P402 Manuale Utente Pagina 59