Toshiba TLCS-900/H1 Series Manual page 544

Original cmos 32-bit microcontroller

Hide thumbs Also See for TLCS-900/H1 Series:

Table of Contents

Description of Operation

(1) Calculation mode

The MAC has the following three types of calculation mode. The calculation mode to be

used is specified in MACCR<MOPMD1:0>. MACCR<MSGMD> is used to select unsigned

or signed mode. The operation of each calculation mode is explained below.

(a) 64 + 32 × 32 mode

In this mode, the contents of the MACMA register and the MACMB register are

multiplied and the result is added to the contents of the MACOR register. Then, the

result is stored back in the MACOR register.

(b) 64 − 32 × 32 mode

In this mode, the contents of the MACMA register and the MACMB register are

multiplied and the result is subtracted from the contents of the MACOR register. Then,

the result is stored back in the MACOR register.

In this mode, the contents of the MACMA register and the MACMB register are

multiplied and the contents of the MACOR register are subtracted from the result.

Then, the result is stored back in the MACOR register.