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| 型号： | R5F3651ENFC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROCONTROLLER, PQFP128 |
| 封装： | 20 X 14 MM, 0.50 MM PITCH, LQFP-128 |
| 文件页数： | 8/81页 |
| 文件大小： | 879K |
| 代理商： | R5F3651ENFC |
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106
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
The Input Capture Register can capture the Timer/Counter value at a given external (edge trig-
gered) event on either the Input Capture pin (ICPn). The Input Capture unit includes a digital
filtering unit (Noise Canceler) for reducing the chance of capturing noise spikes.
The TOP value, or maximum Timer/Counter value, can in some modes of operation be defined
by either the OCRnA Register, the ICRn Register, or by a set of fixed values. When using
OCRnA as TOP value in a PWM mode, the OCRnA Register can not be used for generating a
PWM output. However, the TOP value will in this case be double buffered allowing the TOP
value to be changed in run time. If a fixed TOP value is required, the ICRn Register can be used
as an alternative, freeing the OCRnA to be used as PWM output.
15.1.2
Definitions
The following definitions are used extensively throughout the section:
15.2
Accessing 16-bit Registers
The TCNTn, OCRnx, and ICRn are 16-bit registers that can be accessed by the AVR CPU via
the 8-bit data bus. The 16-bit register must be byte accessed using two read or write operations.
Each 16-bit timer has a single 8-bit register for temporary storing of the high byte of the 16-bit
access. The same temporary register is shared between all 16-bit registers within each 16-bit
timer. Accessing the low byte triggers the 16-bit read or write operation. When the low byte of a
16-bit register is written by the CPU, the high byte stored in the temporary register, and the low
byte written are both copied into the 16-bit register in the same clock cycle. When the low byte of
a 16-bit register is read by the CPU, the high byte of the 16-bit register is copied into the tempo-
rary register in the same clock cycle as the low byte is read.
Not all 16-bit accesses uses the temporary register for the high byte. Reading the OCRnx 16-bit
registers does not involve using the temporary register.
To do a 16-bit write, the high byte must be written before the low byte. For a 16-bit read, the low
byte must be read before the high byte.
The following code examples show how to access the 16-bit Timer Registers assuming that no
interrupts updates the temporary register. The same principle can be used directly for accessing
the OCRnx and ICRn Registers. Note that when using “C”, the compiler handles the 16-bit
access.
Table 15-1.
BOTTOM
The counter reaches the BOTTOM when it becomes 0x0000.
MAX
The counter reaches its MAXimum when it becomes 0xFFFF (decimal 65535).
TOP
The counter reaches the TOP when it becomes equal to the highest value in the count
sequence. The TOP value can be assigned to be one of the fixed values: 0x00FF, 0x01FF,
or 0x03FF, or to the value stored in the OCRnA or ICRn Register. The assignment is
dependent of the mode of operation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R5F3651KCDFC | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:televisions, household appliances, office equipment, communication devices |
| R5F3651KCDFC#V0 | 制造商:Renesas Electronics Corporation 功能描述:M16C/65C 400+8/31 128LQFP 14X20 -40 TO +85 - Trays 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 384KB FLASH 128LQFP |
| R5F3651KCNFC | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:televisions, household appliances, office equipment, communication devices |
| R5F3651KCNFC#V0 | 制造商:Renesas Electronics Corporation 功能描述:M16C/65C 400+8/31 128LQFP 14X2 制造商:Renesas Electronics Corporation 功能描述:M16C/65C 400+8/31 128LQFP 14X20 -20 TO +85 - Trays 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 384KB FLASH 128LQFP |
| R5F3651KDFC | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:RENESAS MCU |
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