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| 型号： | EVAL-ADUC7124QSPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 105/108页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADUC7124 |
| 设计资源： | EVAL-ADUC7124 Schematic ADUC7124 Eval Brd Gerber Files |
| 标准包装： | 1 |
| 系列： | MicroConverter® ADuC7xxx |
| 类型： | MCU |
| 适用于相关产品： | ADUC7124 |
| 所含物品： | 板 |
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ADuC7124/ADuC7126
Data Sheet
Rev. C | Page 96 of 108
Timer3 (Watchdog Time)
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 processor reset.
Normal Mode
Timer3 in normal mode is identical to Timer0, except for the
clock source and the count-up functionality. The clock source is
32 kHz from the PLL and can be scaled by a factor of 1, 16, or
256 (see Figure 55).
09
12
3-
03
7
32.768kHz
PRESCALER
÷ 1, 16 OR 256
16-BIT
UP/DOWN
COUNTER
16-BIT
LOAD
TIMER3
VALUE
WATCHDOG
RESET
TIMER3 IRQ
Figure 55. Timer3 Block Diagram
Watchdog Mode
Watchdog mode is entered by setting Bit 5 in the T3CON MMR.
Timer3 decreases from the value present in the T3LD register
until 0 is reached. T3LD is used as the timeout. The maximum
timeout can be 512 sec using the prescaler/256 and full scale in
T3LD. Timer3 is clocked by the internal 32 kHz crystal when
operating in the watchdog mode. Note that, to enter watchdog
mode successfully, Bit 5 in the T3CON MMR must be set after
writing to the T3LD MMR.
If the timer reaches 0, a reset or an interrupt occurs, depending
on Bit 1 in the T3CON register. To avoid reset or interrupt, any
value must be written to T3CLRI before the expiration period.
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 reset
clears the watchdog enable bit, which causes Timer3 to exit
watchdog mode.
The Timer3 interface consists of four MMRs: T3LD, T3VAL,
T3CON, and T3CLRI.
T3LD Register
Name:
T3LD
Address:
0xFFFF0360
Default Value:
0x0000
Access:
Read/write
T3LD is a 16-bit load register.
T3VAL Register
Name:
T3VAL
Address:
0xFFFF0364
Default Value:
0xFFFF
Access:
Read only
T3VAL is a 16-bit read-only register that represents the current
state of the counter.
T3CON Register
Name:
T3CON
Address:
0xFFFF0368
Default Value:
0x0000
Access:
Read/write
T3CON is the configuration MMR described in Table 145.
Table 145. T3CON MMR Bit Descriptions
Bit
Value
Description
[31:9]
Reserved.
8
Count up.
Set by the user for Timer3 to count up.
Cleared by the user for Timer3 to count down
by default.
7
Timer3 enable bit.
Set by the user to enable Timer3.
Cleared by the user to disable Timer3 by
default.
6
Timer3 mode.
Set by the user to operate in periodic mode.
Cleared by the user to operate in free-running
mode (default mode).
5
Watchdog mode enable bit.
Set by the user to enable watchdog mode.
Cleared by the user to disable watchdog
mode by default.
4
Secure clear bit.
Set by the user to use the secure clear option.
Cleared by the user to disable the secure clear
option by default.
[3:2]
Prescale.
00
Source clock/1 by default.
01
Source clock/16.
10
Source clock/256.
11
Undefined. Equivalent to 00.
1
Watchdog IRQ option bit.
Set by the user to produce an IRQ instead of a
reset when the watchdog reaches 0.
Cleared by the user to disable the IRQ option.
0
Reserved.
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| EVAL-ADUC7126QSPZ | 功能描述:BOARD EVALUATION FOR ADUC7126 RoHS:是 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:MicroConverter® ADuC7xxx 标准包装:1 系列:PICDEM™ 类型:MCU 适用于相关产品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，线缆，元件，CD，PICkit 编程器 产品目录页面:659 (CN2011-ZH PDF) |
| EVAL-ADUC7128QSPZ | 功能描述:KIT DEV FOR ADUC7128 RoHS:是 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ PLUS 套件 产品培训模块:Blackfin® Processor Core Architecture Overview Blackfin® Device Drivers Blackfin® Optimizations for Performance and Power Consumption Blackfin® System Services 特色产品:Blackfin? BF50x Series Processors 标准包装:1 系列:Blackfin® 类型:DSP 适用于相关产品:ADSP-BF548 所含物品:板，软件，4x4 键盘，光学拨轮，QVGA 触摸屏 LCD 和 40G 硬盘 配用:ADZS-BFBLUET-EZEXT-ND - EZ-EXTENDER DAUGHTERBOARDADZS-BFLLCD-EZEXT-ND - BOARD EXT LANDSCAP LCD INTERFACE 相关产品:ADSP-BF542BBCZ-4A-ND - IC DSP 16BIT 400MHZ 400CSBGAADSP-BF544MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542KBCZ-6A-ND - IC DSP 16BIT 600MHZ 400CSBGAADSP-BF547MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF548BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF547BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF544BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF542BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGA |
| EVAL-ADUC7128QSPZ2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Analog Microcontroller ARM7TDMI MCU with 12-Bit ADC and DDS DAC |
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