參數(shù)資料
型號: SST89V54RD-33-C-PIE
廠商: Microchip Technology
文件頁數(shù): 51/92頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 24KB FLASH 40PDIP
標(biāo)準(zhǔn)包裝: 9
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): 32
程序存儲器容量: 16KB(16K 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: 40-DIP(0.600",15.24mm)
包裝: 管件
2011 Silicon Storage Technology, Inc.
DS25087A
10/11
55
FlashFlex MCU
SST89V54RD2/RD / SST89V58RD2/RD
Not Recommended for New Designs
A Microchip Technology Company
Figure 24:PCA Timer/Counter and Compare/Capture Modules
The table below summarizes various clock inputs at two common frequencies.
The four possible CMOD timer modes with and without the overflow interrupt enabled are shown
below. This list assumes that PCA will be left running during idle mode.
The CCON register is associated with all PCA timer functions. It contains run control bits and flags for
the PCA timer (CF) and all modules. To run the PCA the CR bit (CCON.6) must be set by software.
Clearing the bit, will turn off PCA. When the PCA counter overflows, the CF (CCON.7) will be set, and
Table 18: PCA Timer/Counter Inputs
PCA Timer/Counter Mode
Clock Increments
12 MHz
16 MHz
Mode 0: fOSC/12
1 sec
0.75 sec
Mode 1:
330 nsec
250 nsec
Mode 2: Timer 0 Overflows1
1. In Mode 2, the overflow interrupt for Timer 0 does not need to be enabled.
Timer 0 programmed in:
8-bit mode
256 sec
192 sec
16-bit mode
65 msec
49 sec
8-bit auto-reload
1 to 255 sec
0.75 to 191 sec
Mode 3: External Input MAX
0.66 sec
0.50 sec
T0-0.0 25087
Table 19: CMOD Values
PCA Count Pulse Selected
CMOD Value
Without Interrupt Enabled
With Interrupt Enabled
Internal clock, fOSC/12
00H
01H
Internal clock, fOSC/4
02H
03H
Timer 0 overflow
04H
05H
External clock at P1.2
06H
07H
T0-0.0 25087
Module 0
Module 1
Module 2
Module 3
Module 4
PCA Timer/Counter
1255 F23.0
P1.7/CEX4
P1.6/CEX3
P1.5/CEX2
P1.4/CEX1
P1.3/CEX0
16 Bits
16 Bits Each
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