參數(shù)資料
型號(hào)： SST89V58RD2-33-I-TQJE
廠商： Microchip Technology
文件頁(yè)數(shù)： 55/92頁(yè)
文件大?。?/td> 0K
描述： IC MCU 8BIT 40KB FLASH 44TQFP
標(biāo)準(zhǔn)包裝： 160
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(cè)/復(fù)位，POR，WDT
輸入/輸出數(shù)： 36
程序存儲(chǔ)器容量： 32KB（32K x 8）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 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： -40°C ~ 85°C
封裝/外殼： 44-TQFP
包裝： 托盤(pán)
2011 Silicon Storage Technology, Inc.
DS25087A
10/11
59
FlashFlex MCU
SST89V54RD2/RD / SST89V58RD2/RD
Not Recommended for New Designs
A Microchip Technology Company
16-Bit Software Timer Mode
The 16-bit software timer mode is used to trigger interrupt routines, which must occur at periodic inter-
vals. It is setup by setting both the ECOM and MAT bits in the module’s CCAPMn register. The PCA
timer will be compared to the module’s capture registers (CCAPnL and CCAPnH) and when a match
occurs, an interrupt will occur, if the CCFn (CCON SFR) and the ECCFn (CCAPMn SFR) bits for the
module are both set.
If necessary, a new 16-bit compare value can be loaded into CCAPnH and CCAPnL during the inter-
rupt routine. The user should be aware that the hardware temporarily disables the comparator function
while these registers are being updated so that an invalid match will not occur. Thus, it is recom-
mended that the user write to the low byte first (CCAPnL) to disable the comparator, then write to the
high byte (CCAPnH) to re-enable it. If any updates to the registers are done, the user may want to hold
off any interrupts from occurring by clearing the EA bit. (See Figure 26)
Figure 26:PCA Compare Mode (Software Timer)
1255 F25.0
CF
CR
CCF4
CCF3
CCF2
CCF1
CCF0
ECOMn CAPPn CAPNn
MATn
TOGn
PWMn ECCFn
CCON
CCAPMn
n=0 to 4
PCA Interrupt
CH
CL
CCAPnH
CCAPnL
PCA Timer/Counter
0
00
0
16-bit Comparator
Reset
Write to
CCAPnL
Write to
CCAPnH
10
Enable
Match
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