參數(shù)資料
型號: μPD78F9197Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 93/150頁
文件大小: 636K
代理商: ΜPD78F9197Y
Preliminary Product Information
93
μ
PD78F9197Y
7.9
Multiplier
7.9.1
Multiplier function
The multiplier enables a calculation of 8 bits
×
8 bits = 16 bits.
7.9.2
Multiplier configuration
(1) 16-bit multiplication result storage register 0 (MUL0)
This register stores 16-bit multiplication results.
This register holds the result of a multiplication after 16 CPU clock periods.
MUL0 is manipulated using a 16-bit memory manipulation instruction.
A RESET input makes MUL0 undefined.
Caution
MUL0 is designed to be manipulated using a 16-bit memory manipulation instruction. It can
also be manipulated using 8-bit memory manipulation instructions, however. When an 8-bit
memory manipulation instruction is used to set MUL0, it must be in a direct addressing
access mode.
(2) Multiplication data registers A and B (MRA0, MRB0)
These registers store 8-bit multiplication data. The multiplier multiplies the value of MRA0 by the value of
MRB0.
MRA0 and MRB0 are set using an 8-bit memory manipulation instruction.
A RESET input makes these registers undefined.
Figure 7-43 shows the block diagram of the multiplier.
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