参数资料
型号: ADUC836BCPZ
厂商: Analog Devices Inc
文件页数: 30/80页
文件大小: 0K
描述: IC MCU 62K FLASH ADC/DAC 56LFCSP
标准包装: 1
系列: MicroConverter® ADuC8xx
核心处理器: 8052
芯体尺寸: 8-位
速度: 12.58MHz
连通性: EBI/EMI,I²C,SPI,UART/USART
外围设备: POR,PSM,PWM,温度传感器,WDT
输入/输出数: 34
程序存储器容量: 62KB(62K x 8)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 2.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.25 V
数据转换器: A/D 7x16b; D/A 1x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 56-VFQFN 裸露焊盘,CSP
包装: 托盘
ADuC836
–36–
ADuC836
–37–
PULSEWIDTH MODULATOR (PWM)
The PWM on the ADuC836 is a highly flexible PWM offering
programmable resolution and input clock, and can be configured
for any one of six different modes of operation.Two of these modes
allow the PWM to be configured as a - DAC with up to 16 bits
of resolution. A block diagram of the PWM is shown in Figure 26.
CLOCK
SELECT
PROGRAMMABLE
DIVIDER
COMPARE
MODE
PWM0H/L
PWM1H/L
12.583MHz
PWMCLK
32.768kHz
32.768kHz/15
P1.0
P1.1
16-BIT PWM COUNTER
Figure 26. PWM Block Diagram
Table XVI. PWMCON SFR Bit Designations
Bit
Name
Description
7
–––
Reserved for Future Use
6
MD2
PWM Mode Bits
5
MD1
The MD2/1/0 bits choose the PWM mode as follows:
4
MD0
MD2
MD1
MD0
Mode
0
Mode 0: PWM Disabled
0
1
Mode 1: Single Variable Resolution PWM
0
1
0
Mode 2:Twin 8-bit PWM
0
1
Mode 3:Twin 16-bit PWM
1
0
Mode 4: Dual NRZ 16-bit - DAC
1
0
1
Mode 5: Dual 8-bit PWM
1
0
Mode 6: Dual RZ 16-bit - DAC
1
Reserved for Future Use
3
CDIV1
PWM Clock Divider.
2
CDIV0
Scale the clock source for the PWM counter as follows:
CDIV1 CDIV0
Description
0
PWM Counter = Selected Clock/1
0
1
PWM Counter = Selected Clock 4
1
0
PWM Counter = Selected Clock/16
1
PWM Counter = Selected Clock/64
1
CSEL1
PWM Clock Divider.
0
CSEL0
Select the clock source for the PWM as follows:
CSEL1 CSEL0
Description
0
PWM Clock = fXTAL/15
0
1
PWM Clock = fXTAL
1
0
PWM Clock = External Input at P3.4/T0/PWMCLK
1
PWM Clock = fVCO (12.58 MHz)
The PWM uses five SFRs: the control SFR, PWMCON, and
four data SFRs: PWM0H, PWM0L, PWM1H, and PWM1L.
PWMCON (as described in Table XVI) controls the different
modes of operation of the PWM as well as the PWM clock fre-
quency. PWM0H/L and PWM1H/L are the data registers that
determine the duty cycles of the PWM outputs at P1.0 and P1.1.
To use the PWM user software, first write to PWMCON to select
the PWM mode of operation and the PWM input clock.Writing
to PWMCON also resets the PWM counter. In any of the 16-bit
modes of operation (modes 1, 3, 4, 6), user software should write
to the PWM0L or PWM1L SFRs first.This value is written to a
hidden SFR.Writing to the PWM0H or PWM1H SFRs updates
both the PWMxH and the PWMxL SFRs but does not change
the outputs until the end of the PWM cycle in progress.The
values written to these 16-bit registers are then used in the next
PWM cycle.
PWMCON
PWM Control SFR
SFR Address
AEH
Power-On Default Value
00H
Bit Addressable
No
REV. A
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