參數(shù)資料
型號(hào)： ADUuC7027BSTZ62-RL
廠商： Analog Devices, Inc.
英文描述： Precision Analog Microcontroller 12-bit Analog I/O, ARM7TDMI MCU
中文描述： 精密模擬微控制器的12位模擬I / O，ARM7TDMI的微控制器
文件頁(yè)數(shù)： 52/92頁(yè)
文件大?。?/td> 850K
代理商： ADUUC7027BSTZ62-RL
ADuC7019/20/21/22/24/25/26/27
MMRs and Keys
The operating mode, clocking mode, and programmable clock
divider are controlled via two MMRs, PLLCON (see Table 32)
and POWCON (see Table 33). PLLCON controls the operating
mode of the clock system, while POWCON controls the core
clock frequency and the power-down mode.
Rev. A | Page 52 of 92
To prevent accidental programming, a certain sequence (see
Table 34) has to be followed to write to the PLLCON and
POWCON registers.
PLLKEYx Registers
Name
PLLKEY1
PLLKEY2
PLLCON Register
Name
PLLCON
POWKEYx Registers
Name
POWKEY1
POWKEY2
POWCON Register
Name
POWCON
Table 32. PLLCON MMR Bit Designations
Bit
Value
Name
7:6
5
OSEL
Address
0xFFFF0410
0xFFFF0418
Default Value
0x0000
0x0000
Access
W
W
Address
0xFFFF0414
Default Value
0x21
Access
R/W
Address
0xFFFF0404
0xFFFF040C
Default Value
0x0000
0x0000
Access
W
W
Address
0xFFFF0408
Default Value
0x0003
Access
R/W
Description
Reserved.
32 kHz PLL Input Selection.
Set
by
user to use the internal 32 kHz
oscillator.
Set
by default.
Cleared
by
user to use the external 32 kHz crystal.
Reserved.
Clocking Modes.
Reserved.
PLL. Default configuration.
Reserved.
External Clock on P0.7 Pin.
4:2
1:0
00
01
10
11
MDCLK
Table 33. POWCON MMR Bit Designations
Bit
Value
Name
7
6:4
PC
000
001
010
011
Description
Reserved.
Operating Modes.
Active Mode.
Pause Mode.
Nap.
Sleep Mode. IRQ0 to IRQ3 and
Timer2 can wake up the
ADuC7019/7020/7021/7022/7024/
7025/7026/7027.
Stop Mode. IRQ0 to IRQ3 can wake
up the ADuC7019/7020/7021/
7022/7024/7025/7026/7027.
Reserved.
Reserved.
CPU Clock Divider Bits.
41.78 MHz.
20.89 MHz.
10.44 MHz.
5.22 MHz.
2.61 MHz.
1.31 MHz.
653 kHz.
326 kHz.
100
3
2:0
Table 34. PLLCON and POWCON Write Sequence
PLLCON
PLLKEY1 = 0xAA
PLLCON = 0x01
PLLKEY2 = 0x55
Others
000
001
010
011
100
101
110
111
CD
POWCON
POWKEY1 = 0x01
POWCON = User Value
POWKEY2 = 0xF4
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