参数资料
型号: ADUC7034BCPZ
厂商: Analog Devices Inc
文件页数: 116/136页
文件大小: 0K
描述: IC MCU FLASH 32K ANLG IO 48LFCSP
标准包装: 1
系列: MicroConverter® ADuC7xxx
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 20.48MHz
连通性: LIN,SPI,UART/USART
外围设备: POR,PSM,温度传感器,WDT
输入/输出数: 9
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
RAM 容量: 1K x 32
电压 - 电源 (Vcc/Vdd): 3.5 V ~ 18 V
数据转换器: A/D 2x16b
振荡器型: 内部
工作温度: -40°C ~ 115°C
封装/外壳: 48-VFQFN 裸露焊盘,CSP
包装: 托盘
ADuC7034
Rev. B | Page 80 of 136
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. When enabled, it requires
periodic servicing to prevent it from forcing a reset of the
processor.
Timer3 reloads the value from T3LD when Timer3 overflows.
Normal Mode
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 32.768 kHz oscillator and is scalable by a factor of 1,
16, or 256.
Watchdog Mode
Watchdog mode is entered by setting T3CON[5]. Timer3
decrements from the timeout value present in the T3LD register
until 0 is reached. The maximum timeout is 512 sec, using a
maximum prescaler/256 and full scale in T3LD.
User software should not configure a timeout period of less
than 30 ms to avoid any conflict with Flash/EE memory page
erase cycles that require 20 ms to complete a single page erase
cycle and kernel execution.
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 T3CLRI before T3VAL reaches 0. This
reloads the counter with T3LD and begins a new timeout period.
When watchdog mode is entered, T3LD and T3CON are
write protected. These two registers cannot be modified until
a power-on reset event resets the watchdog timer. After any
other reset event, the watchdog timer continues to count. The
watchdog timer should be configured by the initial lines of user
code to avoid an infinite loop of watchdog resets. User software
should only configure a minimum timeout period of 30 ms.
Timer3 is automatically halted during JTAG debug access and
only resumes counting after JTAG has relinquished control of
the ARM7 core. By default, Timer3 continues to count during
power-down. This can be disabled by setting Bit 0 in T3CON.
However, it is recommended to use the default value, that is,
the watchdog timer continues to count during power-down.
Timer3 Interface
The Timer3 interface consists of four MMRs:
T3CON is a configuration MMR and is described in Table 55.
T3LD and T3VAL are 16-bit registers and hold 16-bit
unsigned integers. T3VAL is a read only register.
T3CLRI is an 8-bit register. Writing any value to this
register clears the Timer3 interrupt in normal mode or
resets a new timeout period in watchdog mode.
Timer3 Load Register
Name: T3LD
Address: 0xFFFF0360
Default Value: 0x0040
Access: Read/write
Function: This 16-bit MMR holds the Timer3 reload value.
Timer3 Clear Register
Name: T3CLRI
Address: 0xFFFF036C
Access: Write only
Function: This 8-bit, write only MMR is written (with any
value) by user code to refresh (reload) Timer3 in watchdog
mode to prevent a watchdog timer reset event.
Timer3 Value Register
Name: T3VAL
Address: 0xFFFF0364
Default Value: 0x0040
Access: Read only
Function: This 16-bit, read only MMR holds the current Timer3
count value.
PRESCALER
1, 16, 256
TIMER3 IRQ
WATCHDOG RESET
16-BIT
UP/DOWN COUNTER
LOW POWER
32.768kHz
16-BIT LOAD
TIMER3
VALUE
07
11
6
-03
3
Figure 37. Timer3 Block Diagram
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