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參數(shù)資料
| 型號(hào)： | M34501E4FP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 4.4 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-20 |
| 文件頁(yè)數(shù)： | 165/213頁(yè) |
| 文件大?。?/td> | 3014K |
| 代理商： | M34501E4FP |
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1-42
HARDWARE
4501 Group User’s Manual
RAM BACK-UP MODE
The 4501 Group has the RAM back-up mode.
When the POF or POF2 instruction is executed continuously after
the EPOF instruction, system enters the RAM back-up state.
The POF or POF2 instruction is equal to the NOP instruction when
the EPOF instruction is not executed before the POF or POF2 in-
struction.
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.
In the RAM back-up mode by the POF instruction, system enters
the RAM back-up mode and the voltage drop detection cicuit keeps
operating.
In the RAM back-up mode by the POF2 instruction, all internal
periperal functions stop.
Table 15 shows the function and states retained at RAM back-up.
Figure 38 shows the state transition.
(1) Identification of the start condition
Warm start (return from the RAM back-up state) or cold start (re-
turn 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 or POF2 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;
reset pulse is input to RESET pin, or
reset by watchdog timer is performed, or
voltage drop detection circuit is detected by the voltage drop
In this case, the P flag is “0.”
Table 15 Functions and states retained at RAM back-up
Function
Program counter (PC), registers A, B,
carry flag (CY), stack pointer (SP) (Note 2)
Contents of RAM
Port level
Selected oscillation circuit
Timer control register W1
Timer control registers W2, W6
Clock control register MR
Interrupt control registers V1, V2
Interrupt control register I1
Timer 1 function
Timer 2 function
A-D conversion function
Voltage drop detection circuit
A-D control register Q1
Pull-up control registers PU0 to PU2
Key-on wakeup control registers K0 to K2
External 0 interrupt request flag (EXF0)
Timer 1 interrupt request flag (T1F)
Timer 2 interrupt request flag (T2F)
Watchdog timer flags (WDF1)
Watchdog timer enable flag (WEF)
16-bit timer (WDT)
A-D conversion completion flag (ADF)
Interrupt enable flag (INTE)
POF2
O
O
O
(Note 3)
O
(Note 3)
(Note 4)
(Note 4)
Notes 1:“O” represents that the function can be retained, and “” repre-
sents 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.
2: The stack pointer (SP) points the level of the stack register and is
initialized to “7” at RAM back-up.
3: The state of the timer is undefined.
4: Initialize the watchdog timer flag WDF1 with the WRST instruc-
tion, and then execute the POF or POF2 instruction.
5: This function is operating in the RAM back-up mode. When the
voltage drop is detected, system reset occurs.
RAM back-up
POF
O
O
O
(Note 3)
O (Note 5)
O
(Note 3)
(Note 4)
(Note 4)
FUNCTION BLOCK OPERATIONS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M34501M2-XXXFP | 4-BIT, MROM, MICROCONTROLLER, PDSO20 |
| M34501E4FP | 4-BIT, OTPROM, MICROCONTROLLER, PDSO20 |
| M34501M4-XXXFP | 4-BIT, MROM, MICROCONTROLLER, PDSO20 |
| M34501E4FP | 4-BIT, OTPROM, MICROCONTROLLER, PDSO20 |
| M34502M2-XXXFP | 4-BIT, MROM, MICROCONTROLLER, PDSO24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34501M2 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34501M2-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34501M4 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34501M4-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34502E4 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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