參數(shù)資料
型號: EVAL-ADUC7029QSZ
廠商: Analog Devices Inc
文件頁數(shù): 62/104頁
文件大?。?/td> 0K
描述: EVAL DEV SYSTEM FOR ADUC7029
設計資源: ADuC70xx Serial Download Protocol
ADuC7029 Dev System Schematic
標準包裝: 1
系列: *
ADuC7019/20/21/22/24/25/26/27/28/29
Data Sheet
Rev. F | Page 60 of 104
MMRs and Keys
The operating mode, clocking mode, and programmable clock
divider are controlled via two MMRs: PLLCON (see Table 61)
and POWCON (see Table 64). PLLCON controls the operating
mode of the clock system, whereas POWCON controls the core
clock frequency and the power-down mode.
To prevent accidental programming, a certain sequence (see
Table 65) must be followed to write to the PLLCON and
POWCON registers.
Table 59. PLLKEYx Registers
Name
Address
Default Value
Access
PLLKEY1
0xFFFF0410
0x0000
W
PLLKEY2
0xFFFF0418
0x0000
W
Table 60. PLLCON Register
Name
Address
Default Value
Access
PLLCON
0xFFFF0414
0x21
R/W
Table 61. PLLCON MMR Bit Designations
Bit
Name
Value
Description
7:6
Reserved.
5
OSEL
32 kHz PLL input selection. Set by
user to select the internal 32 kHz
oscillator. Set by default. Cleared by
user to select the external 32 kHz crystal.
4:2
Reserved.
1:0
MDCLK
Clocking modes.
00
Reserved.
01
PLL. Default configuration.
10
Reserved.
11
External clock on the P0.7 pin.
Table 62. POWKEYx Registers
Name
Address
Default Value
Access
POWKEY1
0xFFFF0404
0x0000
W
POWKEY2
0xFFFF040C
0x0000
W
Table 63. POWCON Register
Name
Address
Default Value
Access
POWCON
0xFFFF0408
0x0003
R/W
Table 64. POWCON MMR Bit Designations
Bit
Name
Value
Description
7
Reserved.
6:4
PC
Operating modes.
000
Active mode.
001
Pause mode.
010
Nap.
011
Sleep mode. IRQ0 to IRQ3 and Timer2
can wake up the part.
100
Stop mode. IRQ0 to IRQ3 can wake up
the part.
Others
Reserved.
3
Reserved.
2:0
CD
CPU clock divider bits.
000
41.78 MHz.
001
20.89 MHz.
010
10.44 MHz.
011
5.22 MHz.
100
2.61 MHz.
101
1.31 MHz.
110
653 kHz.
111
326 kHz.
Table 65. PLLCON and POWCON Write Sequence
PLLCON
POWCON
PLLKEY1 = 0xAA
POWKEY1 = 0x01
PLLCON = 0x01
POWCON = user value
PLLKEY2 = 0x55
POWKEY2 = 0xF4
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