參數(shù)資料
型號(hào): μPD789186
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 92/146頁
文件大?。?/td> 630K
代理商: ΜPD789186
Preliminary Product Information
92
μ
PD789186, 789187, 789196, 789197
6.9
Multiplier
6.9.1
Multiplier function
The multiplier enables a calculation of 8 bits
×
8 bits = 16 bits.
6.9.2
Multiplier configuration
(1) 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 generally manipulated with a 16-bit memory manipulation instruction. However, an
8-bit memory manipulation instruction can also be used; in this case, this register must be
accessed by direct addressing.
(2) Multiplication result 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 6-43 shows the block diagram of the multiplier.
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