參數(shù)資料
型號： VMX51C900
廠商： Electronic Theatre Controls, Inc.
英文描述： Versa Mix 8051 MCU with LCD Controller and ADC
中文描述： 8051反之亦然混合與LCD控制器和ADC的微控制器
文件頁數(shù)： 30/55頁
文件大?。?/td> 2395K
代理商： VMX51C900
VMX51C900
______________________________________________________________________________________________
www.ramtron.com
page 30 of 55
PWMB Function Description
The VMX51C900 PWMB can operate as an 8-bit PWM
or as a 5-bit PWM. Unlike the PWMA, when the PWMB
is configured to operate in 5-bit resolution, there are no
narrow pulses generated in the PWM frame cycle.
The PWMB channel is controlled by two SFR registers
PWMB Data & PWMB Control). These registers are
used to control the resolution and input clock division
factor.
PWMB Data Register
The following table describes the PWMB data register
which is used to control the duty cycle of the PWM
output waveform.
When the PWMB is configured to operate in 5-bit
resolution (see below) only the 5 LSBs of the PWMB
register are used.
T
ABLE
27:
PWMB
D
ATA
R
EGISTER
(PWMB)
–
SFR
B3
HH
7
PWMB.7
PWMB.6
3
PWMB.3
PWMB.2
Bit
Mnemonic
7:0
PWMB[7:0]
6
5
4
PWMB.5
1
PWMB.1
PWMB.4
0
PWMB.0
2
Description
PWM duty cycle control
PWMB Control Register
The following table describes the PWMB control
register.
T
ABLE
28:
PWMB
C
ONTROL
R
EGISTER
(PWMBCTRL)
–
SFR
D3
H
7
6
5
4
3
Bit
Mnemonic
[7:3]
Unused
2
PWMBRES
2
1
0
PWMBRES
PWMBCK1
PWMBCK0
Description
-
0: Set PWMB resolution to 8-bit
1: Set PWMB resolution to 5-bit
Input Clock Frequency Divider Bit 1
Input Clock Frequency Divider Bit 0
1
0
PWMBCK1
PWMBCK0
The following formula is used to calculate the PWMB
output frequency:
The
following
table
PWMBCK[1:0] bit values versus output frequency
when a 20MHz oscillator is used:
PWMBK1
PWMBCK0
Divider
provides
examples
of
PWMB clock,
Fosc=20MHz
1.25MHz
625 KHz
312.5KHz
156.2KHz
0
0
1
1
0
1
0
1
16
32
64
128
The following figure describes the relationship between
the PWMB duty cycle vs. the PWMB data register
contents and the PWMBRES bit value.
F
IGURE
17: PWMB
T
IMING
D
IAGRAM EXAMPLES
32T
8
PWMB = 8
256T
64
PWMB = 64
PWMBRES = 1
PWMBRES = 0
32T
16
PWMB = 16
256T
128
PWMB = 128
PWMB Clock = F
osc
2
(PWMBCK [1:0] +4)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
VMX51C900-25-L 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
VMX51C900-25-LG 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
VMX51C900-25-L-G 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Versa Mix 8051 MCU with LCD Controller and ADC
VMX51C900-25-P 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
VMX51C900-25-PG 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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