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參數(shù)資料
| 型號(hào)： | M34570EDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO36 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 42/69頁 |
| 文件大?。?/td> | 687K |
| 代理商： | M34570EDFP |
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Under
development
Preliminary Specifications REV.1.02
Specifications in this manual are tentative and subject to change.
Mitsubishi Microcomputers
M32C/83 group
SINGLE-CHIP 16/32-BIT CMOS MICROCOMPUTER
48
Processor Mode
Processor Mode
(1) Types of Processor Mode
Single-chip mode, memory expansion mode or microprocessor mode can be selected as a processor
mode. Some pin functions, memory map and access space vary depending on the selected processor
mode.
1. Single-chip Mode
In single-chip mode, internal memory space (the SFR, internal RAM and internal ROM) can be ac-
cessed. All I/O ports can be used.
2. Memory Expansion Mode
In memory expansion mode, both external and internal memory spaces can be accessed .
Some pins function as pins for bus control signal. The BYTE pin and register settings determine how
many pins are assigned for these pin functions. (Refer to the section "Bus" for details.)
3. Microprocessor Mode
In microprocessor mode, SFR, internal RAM and external memory space can be accessed. Internal
ROM cannot be accessed.
Some pins function as pins for bus control signal. The BYTE pin and register settings determine how
many pins are assigned for these pin functions. (Refer to the section "Bus" for details.)
(2) Setting Processor Mode
The CNVSS pin and the PM01 to PM00 bits in the PM0 register are combined to set a processor mode.
Avoid setting "012" in the PM01 to PM00 bits.
If the PM01 to PM00 bits are rewritten, a mode corresponding to the PM01 to PM00 bits is selected
regardless of a CNVSS pin level.
Avoid changing the PM01 to PM00 bits when the PM02 to PM07 bits in the PM0 register are rewrit-
ten.
Avoid shifting to microprocessor mode while the CPU is executing a program in the internal ROM .
Avoid shifting to single-chip mode while the CPU is executing a program in an external memory
space.
Figures 1.6.1 and 1.6.2 show the PM0 register and PM1 register. Figure 1.6.3 shows a memory map in
each processor mode.
1. Applying VSS to CNVSS Pin
The microcomputer enters single-chip mode after reset. The PM01 to PM00 bits should be set to "012"
(memory expansion mode) to switch to memory expansion mode after an operation start.
2. Applying VCC to CNVSS Pin
The microcomputer enters microprocessor mode after reset.
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