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Rev. 1.50, 10/04, page 202 of 448

10.1 CPU instruction

Note: Of the SH-4A's section, CPU instructions, those which support the FPU or differ

functionally from those of the SH4AL-DSP are described in section 10.2, CPU

instructions (FPU Related). The other instructions are described in section 10.1, CPU

instructions.

The following resources and functions are used in C-language descriptions of the operation of

CPU instructions.

char 8-bit integer

short 16-bit integer

int 32-bit integer

long 64-bit integer

float single-precision floating point number(32 bits)

double double-precision floating point number(64 bits)

These are data types.

unsigned char Read_Byte(unsigned long Addr);

unsigned short Read_Word(unsigned long Addr);

unsigned long Read_Long(unsigned long Addr);

These reflect the respective sizes of address Addr. A word read from other than a 2n address, or a

longword read from other than a 4n address, will be detected as an address error.

unsigned char Write_Byte(unsigned long Addr, unsigned long Data);

unsigned short Write_Word(unsigned long Addr, unsigned long Data);

unsigned long Write_Long(unsigned long Addr, unsigned long Data);

These write data Data to address Addr, using the respective sizes. A word write to other than a 2n address,

or a longword write to other than a 4n address, will be detected as an address error.

Delay_Slot(unsigned long Addr);

Shifts to execution of the slot instruction at address (Addr).

unsigned long R[16];

unsigned long SR,GBR,VBR;

unsigned long MACH,MACL,PR;

unsigned long PC;

Registers

Renesas SuperH SH-4A User Manual

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