- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄33795 > 4571 (Renesas Technology Corp.) SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER PDF資料下載
參數(shù)資料
| 型號： | 4571 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片4位微機的CMOS |
| 文件頁數(shù)： | 66/126頁 |
| 文件大?。?/td> | 1627K |
| 代理商： | 4571 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁當(dāng)前第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁
Rev.1.02
May 25, 2007
Page 44 of 124
REJ03B0179-0102
4571 Group
RAM BACK-UP MODE
The 4571 Group has the RAM back-up mode.
When the POF instruction is executed continuously after the
EPOF instruction, system enters the RAM back-up state.
The POF instruction is equal to the NOP instruction when the
EPOF instruction is not executed before the POF instruction.
As oscillation stops retaining RAM, the function of reset circuit
and states at RAM back-up mode, current dissipation can be
reduced without losing the contents of RAM.
Table 19 shows the function and states retained at RAM back-up.
Figure 47 shows the state transition.
(1) Identification of the start condition
Warm start (return from the RAM back-up state) or cold start
(return from the normal reset state) can be identified by
examining the state of the power down flag (P) with the SNZP
instruction.
(2) Warm start condition
When the external wakeup signal is input after the system enters
the RAM back-up state by executing the EPOF instruction and
POF instruction continuously, the CPU starts executing the
program from address 0 in page 0. In this case, the P flag is “1.”
(3) Cold start condition
The CPU starts executing the program from address 0 in page 0
when;
“L” level is applied to RESET pin,
system reset (SRST) is performed,
reset by watchdog timer is performed,
reset by the built-in power-on reset circuit is performed, or
reset by the voltage drop detection circuit is performed.
In this case, the P flag is “0.”
Note 1.“O” represents that the function can be retained, and “
×”
represents that the function is initialized.
Registers and flags other than the above are undefined at
RAM back-up, and set an initial value after returning.
Note 2.The stack pointer (SP) points the level of the stack register
and is initialized to “7” at RAM back-up.
Note 3.The state of the timer is undefined.
Note 4.Initialize the watchdog timer flag WDF1 with the WRST
instruction, and then set the system to be in the RAM
back-up mode.
Note 5.The voltage drop detection circuit is invalid.
Note 6.C/CNTR pin outputs “L” level. Other ports retain their
output levels.
Table 19 Functions and states retained at RAM back-up
Function
RAM back-up
Program counter (PC), stack pointer (SP)
(Table 2), carry flag (CY), registers A, B
×
Contents of RAM
O
Interrupt control registers V1, V2
×
Interrupt control registers I1, I2
O
Clock control register MR
×
Timer 1, Timer 2, Timer 3 function
(Note 3)
Watchdog timer function
× (Note 4)
Timer control registers PA, W3
×
Timer control registers W1, W2, W5
O
Voltage drop detection circuit
(Note 5)
Port level
(Note 6)
Key-on wakeup control registers K0 to K2, L1
O
Pull-up control registers PU0 to PU2
O
Port output structure control registers FR0, FR1
O
External interrupt request flags (EXF0, EXF1)
×
Timer interrupt request flags (T1F, T2F, T3F)
(Note 3)
Voltage drop detection circuit interrupt request
flag (VDF)
×
Interrupt enable flag (INTE)
×
Watchdog timer flags (WDF1, WDF2)
× (Note 4)
Watchdog timer enable flag (WEF)
× (Note 4)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 45722.123.242 | 1 mm2, COPPER ALLOY, WIRE TERMINAL |
| 45733.201.004 | 2.5 mm2, COPPER ALLOY, WIRE TERMINAL |
| 45733.417.031 | 2.5 mm2, WIRE TERMINAL |
| 45744.123.211 | 6 mm2, COPPER ALLOY, WIRE TERMINAL |
| 45744.201.004 | 6 mm2, COPPER ALLOY, WIRE TERMINAL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 4571_08 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Standard Characteristics |
| 45-710 | 制造商:GC Electronics 功能描述:EXTENSION CABLE, PARALLEL, 6FT, PUTTY; Cable Length - Imperial:6ft; Cable Length - Metric:1.83m; Connector Type A:Centronics 36 Position Plug; Connector Type B:Centronics 36 Position Receptacle; Jacket Color:Putty; Cable Color:Putty 制造商:Calrad Electronics 功能描述:Cable Assembly Parallel 6m 28AWG 36 POS SCSI to 36 POS SCSI M-F |
| 4-571011-3 | 功能描述:ANVIL 制造商:te connectivity amp connectors 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
| 457102-1 | 制造商:TE Connectivity 功能描述:BLOCK, PLATE MTG - Bulk |
| 45710224PTC2103 | 制造商:Omron Corporation 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。