UPD17062 datasheet(27/298 Pages) RENESAS

номер детали	UPD17062

подробное описание детали	MOS INTEGRATED CIRCUIT

PDF	298 Pages

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производитель	RENESAS [Renesas Technology Corp]

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µPD17062

3. PROGRAM COUNTER (PC)

The program counter addresses program memory or a program. It is a 12-bit binary counter.

Fig. 3-1

Program Counter

PC11

PC9

PC10

PC8

PC6

PC7

PC5

PC3

PC4

PC2

PC0

PC1

12 bits

Priority

Interrupt cause

Vector address

INTNC pin

Internal timer

3VSYNC

Serial interface

Normally, the program counter is incremented by 1 each time an instruction is executed. When a branch

instruction or a subroutine call instruction is executed, however, the address specified in the operand field

is loaded into the program counter. If a skip instruction has been executed, the address of the instruction

following the skip instruction is specified, regardless of the contents of the skip instruction. If the specified

address contains a skip condition, the instruction following the skip instruction is regarded as being a NOP

instruction. That is, the NOP instruction is executed, and the address of the next instruction is specified.

If an interrupt request is accepted, one of addresses 1 to 4 (depending on the cause of the interrupt) is loaded

into the PC.

If a power-on reset or a CE reset is performed, the program counter is reset to address 0.

Table 3-1

Vector Addresses upon Interrupt Occurrence

UPD17062 датащи(PDF) 27 Page - Renesas Technology Corp