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參數(shù)資料
| 型號： | μPD754264 |
| 廠商： | NEC Corp. |
| 英文描述： | 4 Bit RISC Microcontrollers(4 位單片微控制器) |
| 中文描述： | 4位RISC微控制器（4位單片微控制器） |
| 文件頁數(shù)： | 38/68頁 |
| 文件大小： | 320K |
| 代理商： | ΜPD754264 |
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38
μ
PD754264
(3) Explanation of symbols under addressing area column
*1
MB = MBEMBS
(MBS = 0, 4, 15)
*2
MB = 0
*3
MBE = 0 : MB = 0 (000H to 07FH)
MB = 15 (F80H to FFFH)
MBE = 1 : MB = MBS (MBS = 0, 4, 15)
Data memory addressing
*4
MB = 15, fmem = FB0H to FBFH, FF0H to FFFH
*5
MB = 15, pmem = FC0H to FFFH
*6
addr = 000H to FFFH
*7
addr = (Current PC) – 15 to (Current PC) – 1
(Current PC) + 2 to (Current PC) + 16
addr1 = (Current PC) – 15 to (Current PC) – 1
(Current PC) + 2 to (Current PC) + 16
Program memory addressing
*8
caddr = 000H to FFFH
*9
faddr = 0000H to 07FFH
*10
taddr = 0020H to 007FH
*11
addr1 = 000H to FFFH
Remarks 1.
MB indicates memory bank that can be accessed.
2.
In *2, MB = 0 independently of how MBE and MBS are set.
3.
In *4 and *5, MB = 15 independently of how MBE and MBS are set.
4.
*6 to *11 indicate the areas that can be addressed.
(4) Explanation of number of machine cycles column
S denotes the number of machine cycles required by skip operation when a skip instruction is executed. The
value of S varies as follows.
When no skip is made: S = 0
When the skipped instruction is a 1- or 2-byte instruction: S = 1
When the skipped instruction is a 3-byte instruction
Note
: S = 2
Note
3-byt-e instruction: BR !addr, BRA !addr1, CALL !addr, or CALLA !addr1 instruction
Caution The GETI instruction is skipped in one machine cycle.
One machine cycle is equal to one cycle of CPU clock (= t
CY
); time can be selected from among four types
by setting PCC.
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