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| 型號(hào)： | M37542M2T-XXXFP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO36 |
| 封裝： | 8.4 X 15 MM, 0.80 MM PITCH, PLASTIC, SSOP-36 |
| 文件頁(yè)數(shù)： | 48/139頁(yè) |
| 文件大小： | 1448K |
| 代理商： | M37542M2T-XXXFP |
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7542 Group
Rev.3.02
Oct 31, 2006
Page 16 of 134
REJ03B0006-0302
[CPU mode register] CPUM
The CPU mode register contains the stack page selection bit, etc..
This register is allocated at address 003B16.
Switching method of CPU mode register
Switch the CPU mode register (CPUM) at the head of program af-
ter releasing Reset in the following method.
Fig. 14 Switching method of CPU mode register
Fig. 13 Structure of CPU mode register
Oscillation mode selection bit (Note 1)
0 : Ceramic oscillation
1 : RC oscillation
CPU mode register
(CPUM: address 003B16, initial value: 8016)
Stack page selection bit
0 : 0 page
1 : 1 page
Clock division ratio selection bits
b7 b6
0
0 : f(φ) = f(XIN)/2 (High-speed mode)
0
1 : f(φ) = f(XIN)/8 (Middle-speed mode)
1
0 : applied from on-chip oscillator
1
1 : f(φ) = f(XIN) (Double-speed mode)(Note 2)
On-chip oscillator oscillation control bit
0 : On-chip oscillator oscillation enabled
1 : On-chip oscillator oscillation stop
XIN oscillation control bit
0 : Ceramic or RC oscillation enabled
1 : Ceramic or RC oscillation stop
Processor mode bits (Note 1)
b1 b0
0
0 Single-chip mode
0
1
0
1
Not available
b7
b0
2: These bits are used only when a ceramic oscillation is selected.
Note 1: These bits can be rewritten only once after releasing reset. After rewriting
it is disable to write any data to bits. However, by reset bits are
initialized and can be rewritten, again.
(It is not disable to write any data to bits for emulator MCU
“M37542RSS”.)
Do not use these when an RC oscillation is selected.
After releasing reset
Switch the oscillation mode
selection bit (bit 5 of CPUM)
Switch the clock division ratio
selection bits (bits 6 and 7 of CPUM)
Main routine
Start with an on-chip oscillator
An initial value is set as a ceramic
oscillation mode. When it is switched to an
RC oscillation, its oscillation starts.
Select 1/1, 1/2, 1/8 or on-chip oscillator.
Wait by on-chip oscillator operation
until establishment of oscillator clock
When using a ceramic oscillation, wait until
establlishment of oscillation from oscillation starts.
When using an RC oscillation, wait time is not
required basically (time to execute the instruction to
switch from an on-chip oscillator meets the
requirement).
Note: After system is released from reset, an on-chip oscillator turns active automatically
and system operation is started.
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PDF描述 |
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| M37542M2T-XXXGP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542F8VGP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542M2V-XXXGP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542M2V-XXXGP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542M2-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37542M2-XXXFP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M2-XXXGP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M2-XXXHP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M2-XXXSP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M4-XXXFP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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