参数资料
型号: ADUC7121BBCZ
厂商: Analog Devices Inc
文件页数: 93/96页
文件大小: 0K
描述: IC ARM7TDMI MCU 126KB 108CSPBGA
标准包装: 1
系列: MicroConverter® ADuC7xxx
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 41.78MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 126KB(63K x 16)
程序存储器类型: 闪存
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 9x12b,D/A 4x12b
振荡器型: 内部
工作温度: -10°C ~ 95°C
封装/外壳: 108-LFBGA,CSPBGA
包装: 托盘
Data Sheet
ADuC7121
Rev. B | Page 93 of 96
TIMER4—GENERAL-PURPOSE TIMER
Timer4 is a 32-bit general-purpose timer, count down or count
up, with a programmable prescaler. The prescaler source can be
the 32 kHz oscillator, the core clock, or PLL undivided output. This
source can be scaled by a factor of 1, 16, 256, or 32,768. This
gives a minimum resolution of 42 ns when operating at CD
zero, the core is operating at 41.78 MHz, and with a prescaler of 1
(ignoring external GPIO).
The counter can be formatted as a standard 32-bit value or as
hours:minutes:seconds:hundredths.
Timer4 has a capture register (T4CAP), which can be triggered
by a selected IRQ’s source initial assertion. Once triggered, the
current timer value is copied to T4CAP, and the timer keeps
running. This feature can be used to determine the assertion of
an event with increased accuracy.
Timer4 interface consists of five MMRS.
T4LD, T4VAL and T4CAP are 32-bit registers and hold 32-
bit unsigned integers. T4VAL and T4CAP are read only.
T4ICLR is an 8-bit register. Writing any value to this
register clears the Timer1 interrupt.
T4CON is the configuration MMR.
Note that if the part is in a low power mode, and Timer4 is
clocked from the GPIO or oscillator source then, Timer4
continues to operate.
Timer4 reloads the value from T4LD either when Timer4
overflows, or immediately when T4ICLR is written.
Timer4 Load Registers
T4LD is a 32-bit register, which holds the 32-bit value that is
loaded into the counter.
Name:
T4LD
Address:
0xFFFF0380
Default value:
0x00000000
Access:
Read and write
Timer4 Clear Register
This 8-bit, write-only MMR is written (with any value) by user
code to refresh (reload) Timer4.
Name:
T4CLRI
Address:
0xFFFF038C
Default value:
0x00
Access:
Write only
Timer4 Value Register
T4VAL is a 32-bit register that holds the current value of
Timer4.
Name:
T4VAL
Address:
0xFFFF0384
Default value:
0x00000000
Access:
Read only
Timer4 Capture Register
This is a 32-bit register that holds the 32-bit value captured by
an enabled IRQ event.
Name:
T4CAP
Address:
0xFFFF0390
Default value:
0x00000000
Access:
Read only
Timer4 Control Register
This 32-bit MMR configures the mode of operation of Timer4.
Name:
T4CON
Address:
0xFFFF0388
Default value:
0x0000
Access:
Read and write
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