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參數(shù)資料
| 型號(hào)： | NRF9E5-EVKIT915 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
| 中文描述： | 433/868/915MHz RF收發(fā)器與8051兼容的嵌入式微控制器和4輸入，10位ADC |
| 文件頁數(shù)： | 44/104頁 |
| 文件大?。?/td> | 1436K |
| 代理商： | NRF9E5-EVKIT915 |
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PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone +4772898900 - Fax +4772898989
Revision: 1.1
Page 44 of 104
June 2004
14
PWM
The nRF9E5 PWM output is a one-channel PWM with a 2 register interface. The first
register, PWMCON, enables PWM function and PWM period length, which is the
number of clock cycles for one PWM period, as shown in the table below. The other
register, PWMDUTY, controls the duty cycle of the PWM output signal. When this
register is written, the PWM signal will change immediately to the new value. This can
result in 4 transitions within one PWM period, but the transition period will always have
a “DC value” between the “old” sample and the “new” sample.
The table shows how PWM frequency (or period length) and PWM duty cycle are
controlled by the settings in the two PWM SFR-registers. For a crystal frequency of 16
MHz, PWM frequency range will be about 1-253 kHz.
PWMCON[7:6]
(Number of bits)
PWM frequency
PWMDUTY
(duty cycle)
00 (0)
0 (PWM module inactive)
0
01 (6)
[
]
(
)
1
+
0
:
5
63
1
PWMCON
f
XO
[
]
63
0
:
5
PWMDUTY
10 (7)
[
]
(
)
1
+
0
:
5
127
1
PWMCON
f
XO
[
]
127
0
:
6
PWMDUTY
11 (8)
[
]
(
)
1
+
0
:
5
255
1
PWMCON
f
XO
255
PWMDUTY
Table 34 PWM frequency and duty-cucle.
PWM is controlled by SFR 0xA9 and 0xAA.
Addr
SFR
(hex)
A9
R/W
#bit
Init
(hex)
Name
Function
R/W
8
0
PWMCON
PWM control register
7-6: Enable / period length select
00: Disable PWM
01: Period length is 6 bit
10: Period length is 7 bit
11: Period length is 8 bit
5-0: PWM frequency prescale factor
(see table above)
PWM duty cycle (6 to 8 bits according to
period length)
AA
R/W
8
0
PWMDUTY
Table 35 PWM control registers - SFR 0xA9 and 0xAA.
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| NRF9E5IC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
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