參數(shù)資料
型號(hào)： UPD17149GT
廠商： NEC Corp.
英文描述： SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 小，通用4位單晶片微控制器
文件頁(yè)數(shù)： 20/102頁(yè)
文件大?。?/td> 408K
代理商： UPD17149GT
20
μ
PD17145(A1), 17147(A1), 17149(A1)
5. DATA MEMORY (RAM)
The data memory is used to store data for operation and control. Data can always be written to or read from
this memory by using an instruction.
5.1 Configuration of Data Memory
The data memory is assigned addresses each consisting of 7 bits. The higher 3 bits of an address are called
a “row address”, while the lower 4 bits are called a “column address”.
Take address 1AH for example. The row address of this address is 1H and the column address is 0AH.
One address consists of 4 bits (= 1 nibble) of memory.
The data memory consists of an area to which the user can save data, and areas to which special functions
are allocated in advance. These areas are:
System register (SYSREG)
Data buffer (DBF)
Port register
(Refer to 7. SYSTEM REGISTER (SYSREG).)
(Refer to 9. DATA BUFFER (DBF).)
(Refer to 11. PORT.)
Figure 5-1. Configuration of Data Memory
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
DBF3 DBF2 DBF1 DBF0
P0E
(4 bits)
P0F
(2 bits)
P0A
(4 bits)
P0B
(4 bits)
P0C
(4 bits)
P0D
(4 bits)
0
1
2
3
4
5
6
7
BANK0
Example :
Address
1AH of BANK0
System register
Column address
相關(guān)PDF資料
PDF描述
UPD17149CTA1 SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD17149GTA1 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS
UPD1714G 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC
UPD1715 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC
UPD1716CT 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC
UPD1717CU 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
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