參數(shù)資料
型號(hào): ADUC7032BSTZ-8V-RL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 112/128頁(yè)
文件大小: 0K
描述: IC BATTERY SENSOR PREC 48-LQFP
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(chǔ)器容量: 96KB(48K x 16)
程序存儲(chǔ)器類(lèi)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(zhuǎn)換器: A/D 2x16b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 105°C
封裝/外殼: 48-LQFP
包裝: 標(biāo)準(zhǔn)包裝
其它名稱(chēng): ADUC7032BSTZ-8V-RLDKR
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Preliminary Technical Data
ADuC7032
Rev. PrD | Page 84 of 128
TIMER3 - WATCHDOG TIMER
Timer3 has two modes of operation, normal mode and
watchdog mode. The Watchdog timer is used to recover from
an illegal software state. Once enabled it requires periodic
servicing to prevent it from forcing a reset of the processor.
Timer3 reloads the value from T3LD either when TIMER3
overflows, or immediately when T3CLRI is written.
Normal mode:
The Timer3 in normal mode is identical to Timer0, in 16-bit
mode of operation, except for the clock source. The clock
source is the Low Power 32.768kHz oscillator and can be
scaled by a factor of 1, 16, or 256. Timer3 also features a
capture facility, which allows the capture of the current timer
value if the Timer2 interrupt is enabled via IRQEN[5].
Watchdog mode:
Watchdog mode is entered by setting T3CON[5]. Timer3
decrements from the timeout value present in T3LD Register
until zero. The maximum timeout is 512 seconds, using the
maximum pre-scalar /256 and full-scale in T3LD.
User software should only configure a minimum timeout
period of 30msecs. This is to avoid any conflict with Flash/EE
memory page erase cycles, which require 20ms to complete a
single page erase cycle.
If T3VAL reaches 0, a reset or an interrupt occurs, depending
on T3CON[1]. To avoid a reset or an interrupt event, any value
must be written to T3ICLR before T3VAL reaches zero. This
reloads the counter with T3LD and begins a new timeout
period.
Once watchdog mode is entered, T3LD and T3CON are write-
protected. These two registers can not be modified until a reset
event resets the Watchdog Timer.
Timer3 is automatically halted during JTAG debug access and
will only recommence counting once JTAG has relinquished
control of the ARM7 core. By default, Timer3 continues to
count during power-down. This may be disabled by setting bit
zero in T3CON. It is recommended that the default value is
used, i.e. that the Watchdog Timer continues to count during
power-down.
05
99
4-
0
33
PRESCALER
1, 16, 256
TIMER3 IRQ
WATCHDOG RESET
16-BIT
UP/DOWN COUNTER
LOW POWER
32.768kHz
16-BIT LOAD
TIMER3
VALUE
Figure 33 : Timer3 Block Diagram
Timer3 Interface:
Timer3 interface consists of four MMRS:
- T3CON is the configuration MMR described in Table 37
- T3LD and T3VAL are 16-bit registers (bit 0 to 15) and hold
16-bit unsigned integers. T3VAL is read-only.
- T3CLRI is an 8-bit register. Writing any value to this register
will clear the Timer3 interrupt in normal mode or will reset a
new timeout period in watchdog mode
Timer3 Load Register :
Name :
T3LD
Address :
0xFFFF0364
Default Value :
0x03D7
Access :
Write Once Only
Function :
This 16-bit MMR holds the Timer3 reload
value.
Timer3 Value Register :
Name :
T3VAL
Address :
0xFFFF0364
Default Value :
0x03D7
Access :
Read Only
Function :
This 16-bit, read-only MMR holds the
currentTimer3 count value.
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