参数资料
型号: EVAL-ADUC7122QSPZ
厂商: Analog Devices Inc
文件页数: 86/96页
文件大小: 0K
描述: BOARD EVALUATION FOR ADUC7122
设计资源: EVAL-ADUC7122 Schematic
ADUC7122 Gerber Files
ADUC7122 BOM
标准包装: 1
系列: MicroConverter® ADuC7xxx
类型: MCU
适用于相关产品: ADUC7122
所含物品:
ADuC7122
Rev. 0 | Page 87 of 96
TIMER2—WAKE-UP TIMER
Timer2 is a 32-bit wake-up timer, count down or count up, with
a programmable prescaler. The prescaler is clocked directly from 1
of 4 clock sources, including the core clock (default selection),
the internal 32.768 kHz oscillator, the external 32.768 kHz
watch crystal, or the PLL undivided clock. The selected clock
source can be scaled by a factor of 1, 16, 256, or 32,768. The
wake-up timer continues to run when the core clock is disabled.
This gives a minimum resolution of 22 ns when the core is
operating at 41.78 MHz and with a prescaler of 1. Capture of
the current timer value is enabled if the Timer2 interrupt is
enabled via IRQEN[4] (see Table 128).
The counter can be formatted as plain 32-bit value or as
hours:minutes:seconds:hundredths.
Timer2 reloads the value from T2LD either when Timer2
overflows or immediately when T2ICLR is written.
The Timer2 interface consists of four MMRs, shown in
Table 157. Timer2 Interface Registers
Register
Description
T2LD
32-bit register. Holds 32-bit unsigned integers.
T2VAL
32-bit register. Holds 32-bit unsigned integers. This
register is read only.
T2CLRI
8-bit register. Writing any value to this register clears
the Timer2 interrupt.
T2CON
Configuration MMR.
Table 158. Timer2 Load Registers
Name
Address
Default Value
Access
T2LD
0xFFFF0340
0x00000
R/W
T2LD is a 32-bit register, which holds the 32-bit value that is
loaded into the counter.
Table 159. Timer2 Clear Register
Name
Address
Default Value
Access
T2CLRI
0xFFFF034C
0x00
W
This 8-bit write-only MMR is written (with any value) by user
code to refresh (reload) Timer2.
Table 160. Timer2 Value Register
Name
Address
Default Value
Access
T2VAL
0xFFFF0344
0x0000
R
T2VAL is a 32-bit register that holds the current value of Timer2.
Table 161. Timer2 Control Register
Name
Address
Default Value
Access
T2CON
0xFFFF0348
0x0000
R/W
This 32-bit MMR configures the mode of operation for Timer2.
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