參數(shù)資料
型號: ADUuC7027BSTZ62-RL
廠商: Analog Devices, Inc.
英文描述: Precision Analog Microcontroller 12-bit Analog I/O, ARM7TDMI MCU
中文描述: 精密模擬微控制器的12位模擬I / O,ARM7TDMI的微控制器
文件頁數(shù): 76/92頁
文件大?。?/td> 850K
代理商: ADUUC7027BSTZ62-RL
ADuC7019/20/21/22/24/25/26/27
Timer0 (RTOS Timer)
Timer0 is a general-purpose, 16-bit timer (count-down) with a
programmable prescaler (see Figure 63). The prescaler source is
the core clock frequency (HCLK) and can be scaled by factors
of 1, 16, or 256.
Rev. A | Page 76 of 92
0
16-BIT
LOAD
TIMER0
VALUE
16-BIT
DOWN
COUNTER
PRESCALER
/1, 16 OR 256
HCLK
TIMER0 IRQ
ADC CONVERSION
Figure 63. Timer0 Block Diagram
Timer0’s interface consists of four MMRS: T0LD, T0VAL,
T0CON, and T0CLRI.
T0LD Register
Name
T0LD
Address
0xFFFF0300
Default Value
0x0000
Access
R/W
T0LD is a 16-bit load register.
T0VAL Register
Name
T0VAL
Address
0xFFFF0304
Default Value
0xFFFF
Access
R
T0VAL is a 16-bit read-only register representing the current
state of the counter.
T0CON Register
Name
T0CON
Address
0xFFFF0308
Default Value
0x0000
Access
R/W
T0CON is the configuration MMR described in Table 74.
Table 74. T0CON MMR Bit Descriptions
Bit
Value
Description
31:8
Reserved.
7
Timer0 Enable Bit.
Set
by user to enable Timer0.
Cleared
by user to disable Timer0 by default.
6
Timer0 Mode.
Set
by user to operate in
periodic mode.
Cleared
by user to operate in
free-running mode. Default mode.
5:4
Reserved.
3:2
Prescale.
00
Core Clock/1. Default value.
01
Core Clock/16.
10
Core Clock/256.
11
Undefined. Equivalent to 00.
1:0
Reserved.
T0CLRI Register
Name
T0CLRI
Address
0xFFFF030C
Default Value
0xFF
Access
W
T0CLRI is an 8-bit register. Writing any value to this register
clears the interrupt.
Timer1 (General-Purpose Timer)
Timer1 is a general-purpose, 32-bit timer (count down or count
up) with a programmable prescaler. The source can be the
32 kHz external crystal, the core clock frequency, or an external
GPIO, P1.0 or P0.6. This source can be scaled by a factor of 1,
16, 256, or 32768.
The counter can be formatted as a standard 32-bit value or as
Hours: Minutes: Seconds: Hundredths.
Timer1 has a capture register (T1CAP), which can be triggered
by a selected IRQ source initial assertion. This feature can be
used to determine the assertion of an event more accurately
than the precision allowed by the RTOS timer when the IRQ is
serviced.
Timer1 can be used to start ADC conversions as shown in the
block diagram in Figure 64.
0
32kHz OSCILLATOR
HCLK
P0.6
P1.0
IRQ[31:0]
P/1, 16, 256
OR 32768
U32-BIT
LOAD
VALUE
CAPTURE
TIMER1 IRQ
ADC CONVERSION
Figure 64. Timer1 Block Diagram
Timer1’s interface consists of five MMRS: T1LD, T1VAL,
T1CON, T1CLRI, and T1CAP.
T1LD Register
Name
T1LD
Address
0xFFFF0320
Default Value
0x00000000
Access
R/W
T1LD is a 16-bit load register.
T1VAL Register
Name
T1VAL
Address
0xFFFF0324
Default Value
0xFFFFFFFF
Access
R
T1VAL is a 16-bit read-only register that represents the current
state of the counter.
T1CON Register
Name
T1CON
Address
0xFFFF0328
Default Value
0x0000
Access
R/W
T1CON is the configuration MMR described in Table 75.
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