參數(shù)資料
型號: ADUC7036DCPZ
廠商: Analog Devices Inc
文件頁數(shù): 103/132頁
文件大小: 0K
描述: IC MCU 96K FLASH DUAL 48LFCSP
標準包裝: 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
外圍設備: PSM,溫度傳感器,WDT
輸入/輸出數(shù): 9
程序存儲器容量: 96KB(48K x 16)
程序存儲器類型: 閃存
RAM 容量: 1.5K x 32
電壓 - 電源 (Vcc/Vdd): 3.5 V ~ 18 V
數(shù)據(jù)轉換器: 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
ADuC7036
Rev. C | Page 72 of 132
T0
SYNC
T1
SYNC
T2
SYNC
T3
SYNC
T4
SYNC
T0
T1
T2
T3
T4
T0IRQ
T1IRQ
T2IRQ
T3IRQ
WdRst
T4IRQ
T0 REG
USER
MMR
INTERFACE
T1 REG
T2 REG
T3 REG
T4 REG
CORE
CLOCK
ARM7TDMI
AMBA
LOW
POWER
OSCILLATOR
HIGH
PRECISION
OSCILLATOR
GPIO
XTAL
0
1
2
4
AMBA
TIMER BLOCK
07
47
4-
0
58
Figure 33. Timer Block Diagram
UNSYNCHRONIZED
SIGNAL
SYNCHRONIZED
SIGNAL
TIMER 2
LOW POWER
CLOCK DOMAIN
SYNCHRONIZER
FLIP-FLOPS
CORE CLOCK
(FCORE)
DOMAIN
TARGET_CLOCK
07
47
4-
05
9
Figure 34. Synchronizer for Signals Crossing Clock Domains
As shown in Figure 33, the MMR logic and core timer logic
reside in separate and asynchronous clock domains. Any data
coming from the MMR core clock domain and being passed to
the internal timer domain must be synchronized to the internal
timer clock omain to ensure it is latched correctly into the core
timer clock domain. This is achieved by using two flip-flops as
shown in Figure 34 to not only synchronize but also to double
buffer the data and thereby ensuring data integrity in the timer
clock domain.
As a result of the synchronization block, while timer control
data is latched almost immediately (with the fast, core clock) in
the MMR clock domain, this data in turn will not reach the core
timer logic for at least two periods of the selected internal timer
domain clock.
PROGRAMMING THE TIMERS
Understanding synchronization across timer domains also
requires that the user code carefully programs the timers when
stopping or starting them. The recommended code controls the
timer block when stopping and starting the timers and when
using different clock domains. This can critical, especially if
timers are enabled to generate an IRQ or FIQ exception; Timer2
is used as an example.
Halting Timer2
When halting Timer2, it is recommended that the IRQEN
bit for Timer2 be masked (using IRQCLR). This prevents
unwanted IRQs from generating an interrupt in the MCU
before the T2CON control bits have been latched in the Timer2
internal logic.
IRQCLR = WAKEUP_TIMER_BIT;
//Masking interrupts
T2CON=0x00;
//Halting the timer
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