參數(shù)資料
型號: SST89V58RD2-33-C-NJE
廠商: Microchip Technology
文件頁數(shù): 58/92頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 40KB FLASH 44PLCC
標準包裝: 26
系列: FlashFlex®
核心處理器: 8051
芯體尺寸: 8-位
速度: 33MHz
連通性: EBI/EMI,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,WDT
輸入/輸出數(shù): 36
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 8K x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
2011 Silicon Storage Technology, Inc.
DS25087A
10/11
61
FlashFlex MCU
SST89V54RD2/RD / SST89V58RD2/RD
Not Recommended for New Designs
A Microchip Technology Company
Pulse Width Modulator
The Pulse Width Modulator (PWM) mode is used to generate 8-bit PWMs by comparing the low byte of
the PCA timer (CL) with the low byte of the compare register (CCAPnL). When CL < CCAPnL the out-
put is low. When CL
≥ CCAPnL the output is high. To activate this mode, the user must set the PWM
and ECOM bits in the module’s CCAPMn SFR. (See Figure 28 and Table 23)
In PWM mode, the frequency of the output depends on the source for the PCA timer. Since there is
only one set of CH and CL registers, all modules share the PCA timer and frequency. Duty cycle of the
output is controlled by the value loaded into the high byte (CCAPnH). Since writes to the CCAPnH reg-
ister are asynchronous, a new value written to the high byte will not be shifted into CCAPnL for com-
parison until the next period of the output (when CL rolls over from 255 to 00).
To calculate values for CCAPnH for any duty cycle, use the following equation:
CCAPnH = 256(1 - Duty Cycle)
where CCAPnH is an 8-bit integer and Duty Cycle is a fraction.
Figure 28:PCA Pulse Width Modulator Mode
Table 23: Pulse Width Modulator Frequencies
PCA Timer Mode
PWM Frequency
12 MHz
16 MHz
1/12 Oscillator Frequency
3.9 KHz
5.2 KHz
1/4 Oscillator Frequency
11.8 KHz
15.6 KHz
Timer 0 Overflow:
8-bit
15.5 Hz
20.3 Hz
16-bit
0.06 Hz
0.08 Hz
8-bit Auto-Reload
3.9 KHz to 15.3 Hz
5.2 KHz to 20.3 Hz
External Input (Max)
5.9 KHz
7.8 KHz
T0-0.0 25087
1255 F27.0
ECOMn CAPPn CAPNn
MATn
TOGn
PWMn ECCFn
CCAPMn
n=0 to 4
CL
CCAPnL
CCAPnH
PCA Timer/Counter
0
00
8-bit Comparator
Overflow
CL < CCAPnL
CL >= CCAPnL
Enable
CEXn
0
1
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