參數(shù)資料
型號： ADUC7034BCPZ
廠商： Analog Devices Inc
文件頁數(shù)： 97/136頁
文件大?。?/td> 0K
描述： IC MCU FLASH 32K ANLG IO 48LFCSP
標(biāo)準(zhǔn)包裝： 1
系列： MicroConverter® ADuC7xxx
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 20.48MHz
連通性： LIN，SPI，UART/USART
外圍設(shè)備： POR，PSM，溫度傳感器，WDT
輸入/輸出數(shù)： 9
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： 閃存
RAM 容量： 1K x 32
電壓 - 電源 (Vcc/Vdd)： 3.5 V ~ 18 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 2x16b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 115°C
封裝/外殼： 48-VFQFN 裸露焊盤，CSP
包裝： 托盤
ADuC7034
Rev. B | Page 63 of 136
The operating mode, clocking mode, and programmable clock
divider are controlled using two MMRs, PLLCON and POWCON,
and the status of the PLL is indicated by PLLSTA. PLLCON
controls the operating mode of the clocking system, and
POWCON controls both the core clock frequency and the power-
down mode. PLLSTA indicates the presence of an oscillator on
the XTAL1 pin and provides information about the PLL lock
status and the PLL interrupt.
Before powering down the ADuC7034, it is recommended to
switch the clock source for the PLL to the low power 131 kHz
oscillator to reduce wake-up time. The low power oscillator is
always active.
When the ADuC7034 wakes up from a power-down, the MCU
core begins executing code as soon as the PLL starts oscillating.
This occurs before the PLL has locked to a frequency of
20.48 MHz. To ensure that the Flash/EE memory controller is
executing with a valid clock, the controller is driven with a PLL
output divide-by-8 clock source while the PLL is locking. When
the PLL locks, the PLL output is switched from the PLL output
divide-by-8 to the locked PLL output.
If user code requires an accurate PLL output, user code must
poll the PLL lock status bit (PLLSTA[1]) after a wake-up before
resuming normal code execution.
The PLL is locked within 2 ms if the PLL is clocked from an
active clock source, such as a low power 131 kHz oscillator,
after waking up.
PLLCON is a protected MMR with two 32-bit keys: PLLKEY0
(prewrite key) and PLLKEY1 (postwrite key). The key values
are as follows:
PLLKEY0 = 0x000000AA
PLLKEY1 = 0x00000055
POWCON is a protected MMR with two 32-bit keys: POWKEY0
(prewrite key) and POWKEY1 (postwrite key). The key values
are as follows:
POWKEY0 = 0x00000001
POWKEY1 = 0x000000F4
An example of writing to both MMRs is as follows:
POWKEY0
=
0x01
//POWCON key
POWCON
=
0x00
//Full power-down
POWKEY1
=
0xF4
//POWCON key
iA1*iA2
//Dummy cycle to
clear the pipeline, where iA1 and iA2 are
defined as longs and are not 0
PLLKEY0
=
0xAA
//PLLCON key
PLLCON
=
0x0
//Switch to low
power osc.
PLLKEY1
=
0x55
//PLLCON key
iA1*iA2
//Dummy cycle to
prevent Flash/EE access during clock change
SYSTEM CLOCK REGISTERS
PLLSTA Register
Name:
PLLSTA
Address:
0xFFFF0400
Default Value:
0xXX
Access:
Read only
Function:
This 8-bit register allows user code to monitor
the lock state of the PLL and the status of the
external crystal.
Table 43. PLLSTA MMR Bit Designations
Bit
Description
7 to 3
Reserved.
2
XTAL clock. This read only bit is a live representation
of the current logic level on XTAL1. It indicates if
an external clock source is present by alternating
between high and low at a frequency of 32.768 kHz.
1
PLL lock status bit. This is a read only bit.
Set when the PLL is locked and outputting 20.48 MHz.
Cleared when the PLL is not locked and outputting
an fCORE divide-by-8 clock source.
0
PLL interrupt.
Set if the PLL lock status bit signal goes low.
Cleared by writing 1 to this bit.
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