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SmartBook for Renesas R8C/Tiny Microcontrollers

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Interrupt on overflow

(INTO)

Save context

(STCTX)

Transfer to control register

(LDC)

Interrupt for undefined instruction

(UND)

Restore context

(LDCTX)

Wait

(WAIT)

Transfer to INTB register

(LDINTB)

Now, we proceed further into a detailed discussion to get the complete picture on

the processing power of the R8C/Tiny devices.

The device handles the multiplying operations at a faster rate thanks to the built-

in hardware 16 X 16 multiplier. For an example, the 16 X 16 multiplying for both

signed and unsigned operation requires just a single instruction consuming only

three bytes and is executed in four instruction cycles.

Likewise, 8 X 8 unsigned multiply is another single instruction requiring three

bytes of program memory and gets done in four instruction cycles.

For the division operations, for both signed and unsigned data types, the device

has single instruction for 16 / 8 and 32 / 16 type divisions.

Signed data requires two bytes of program memory and

the unsigned data needs three bytes of memory. 22

instruction cycles are required for the signed data

and 18 cycles for the unsigned.

Taking 16-bit addition/ subtraction into study,

we find these operations require single

instruction with two bytes of program memory

and getting executed in two instruction

cycles.

The devices support arithmetic operations

on the decimal data using few instructions.



 The 16

X 16 multiplying

for both signed and

unsigned operation re-

quires just a single instruction

consuming only three bytes and

is executed in four instruction

cycles.



For the division operations,

for both signed

and unsigned data

types, the device has

single instruction for

16/8 and 32/16 type

divisions.