參數(shù)資料
型號: M37640E8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述: 單芯片8位CMOS單片機
文件頁數(shù): 19/172頁
文件大?。?/td> 1193K
代理商: M37640E8
7600 Series
Mitsubishi Microcomputer
M37640E8-XXXF Preliminary Specification
CPU Mode Registers
7/9/98
2-7
2.2
CPU Mode Registers
This device has two CPU mode registers: CPU Mode Register A (CPMA) and CPU Mode Register B
(CPMB) that control the processor mode, clock, slow memory wait and other CPU functions. The bit
representation of each register is described in Figure 2-3 and Figure 2-4:
Figure 2-3. CPU Mode Register A
Figure 2-4. CPU Mode Register B
Address
Description
Acronym and
Value at Reset
0000
16
CPU mode register A
CPMA=0C
CPMB=83
0001
16
CPU mode register B
CPMA0,1
Processor Mode Bits (bits 1,0)
Bit 1
0
0
1
1
Stack Page Selection Bit (bit 2)
0: In page 0 area
1: In page 1 area
X
cout
Drive Capacity Selection Bit (bit 3)
0: Low
1: High
Clock XC
in
-XC
out
Stop Bit (bit 4)
0: Stop
1: Oscillator
Clock X
-X
Stop Bit (bit 5)
0: Oscillator
1: Stop
Internal Clock Selection Bit (bit 6)
0: External Clock
1: f
External Clock Selection Bit (bit 7)
0: X
in
-X
1: XC
in
-XC
out
Bit 0
0:
1:
0:
1:
Single-Chip Mode
Memory Expansion Mode
Microprocessor Mode
Not used
CPMA2
CPMA3
CPMA4
CPMA5
CPMA6
CPMA7
7
0
CPMA7
CPMA6
CPMA5
CPMA4
CPMA3
CPMA2
CPMA1
CPMA0
Access: R/W
Reset: 0C
16
Address: 0000
16
CPMB0,1
Slow Memory Wait Bits (bits 1,0)
Bit 1
Bit 0
0
0
1
1
Slow Memory Mode Bit (bits 3,2)
Bit 3
Bit 2
0
0
1
1
Expanded Data Memory Access Bit (bit 4)
0: EDMA output disabled (64 Kbyte data access area)
1: EDMA output enabled (greater than 64 Kbytes data access area)
HOLD Function Enable Bit (bit 5)
0: HOLD Function Disabled
1: HOLD Function Enabled
Reserved (Read/Write “0”)
X
out
Drive Capacity Selection Bit (bit 7)
0: Low
1: High (default state after reset and after STOP mode)
0:
1:
0:
1:
No wait
One time wait
Two time wait
Three time wait
CPMB2,3
0:
1:
0:
1:
Software wait
Not used
Fixed wait by RDY pin L
Extended RDY wait
CPMB4
CPMB5
CPMB6
CPMB7
Access: R/W
Reset: 83
16
Address: 0001
16
7
0
CPMB4
CPMB3
CPMB2
CPMB1
CPMB0
CPMB7
Reserved
CPMB5
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