参数资料
型号: UPD78F9202MA-CAC-A
厂商: Renesas Electronics America
文件页数: 18/158页
文件大小: 0K
描述: MCU 8BIT 4KB FLASH 128B RAM
标准包装: 400
系列: 78K0S/Kx1+
核心处理器: 78K0S
芯体尺寸: 8-位
速度: 10MHz
外围设备: LVD,POR,PWM,WDT
输入/输出数: 7
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 4x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 10-LSSOP(0.225",5.72mm 宽)
包装: 托盘
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00 (
μPD78F920x ONLY)
User’s Manual U18172EJ3V0UD
112
Figure 6-25. Timing of Pulse Width Measurement Operation by Free-Running Counter
and Two Capture Registers (with Rising Edge Specified)
t
0000H
FFFFH
0001H
D0
D2
D1
D3
D2
D3
D1
D0 + 1
D2 + 1
D1 + 1
INTTM010
CR000 capture value
Count clock
TM00 count value
TI000 pin input
CR010 capture value
(D1
D0) × t
(D3
D2) × t
(D2
D1) × t
Note
Note The carry flag is set to 1. Ignore this setting.
(4) Pulse width measurement by means of restart
Specify both the rising and falling edges as the valid edges of the TI000 pin, by using bits 4 and 5 (ES000 and
ES010) of PRM00.
When input of a valid edge to the TI000 pin is detected, the count value of 16-bit timer/counter 00 (TM00) is
taken into 16-bit timer capture/compare register 010 (CR010), and then the pulse width of the signal input to
the TI000 pin is measured by clearing TM00 and restarting the count.
The edge specification can be selected from two types, rising or falling edges, by bits 4 and 5 (ES000 and
ES010) of prescaler mode register 00 (PRM00)
Sampling is performed at the interval selected by prescaler mode register 00 (PRM00) and a capture operation
is only performed when a valid level of the TI000 pin is detected twice, thus eliminating noise with a short
pulse width.
Caution
The measurable pulse width in this operation example is up to 1 cycle of the timer counter.
Figure 6-26. Control Register Settings for Pulse Width Measurement by Means of Restart
(with Rising Edge Specified) (1/2)
(a) Capture/compare control register 00 (CRC00)
7
0
6
0
5
0
4
0
3
0
CRC002
1
CRC001
1
CRC000
1
CRC00
CR000 used as capture register
Captures to CR000 at inverse edge to valid edge of TI000Note.
CR010 used as capture register
Note If the valid edge of TI000 is specified to be both the rising and falling edges, 16-bit timer capture/compare
register 000 (CR000) cannot perform the capture operation.
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