- 您现在的位置：买卖IC网 > PDF目录98142 > SST89E554A-40-I-TQJ (SILICON STORAGE TECHNOLOGY INC) 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 PDF资料下载
参数资料
| 型号： | SST89E554A-40-I-TQJ |
| 厂商： | SILICON STORAGE TECHNOLOGY INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | MS-026ACB, TQFP-44 |
| 文件页数： | 44/87页 |
| 文件大小： | 996K |
| 代理商： | SST89E554A-40-I-TQJ |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页当前第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页
Preliminary Specifications
FlashFlex51 MCU
SST89E554A / SST89V554A
49
2003 Silicon Storage Technology, Inc.
S71228-00-000
6/03
8.0 PROGRAMMABLE COUNTER ARRAY
The Programmable Counter Array (PCA) present on the
SST89E/V554A is a special 16-bit timer that has five 16-bit
capture/compare modules. Each of the modules can be
programmed to operate in one of four modes: rising and/or
falling edge capture, software timer, high-speed output, or
pulse width modulator. The 5th module can be pro-
grammed as a Watchdog Timer in addition to the other four
modes. Each module has a pin associated with it in port 1.
Module 0 is connected to P1.3 (CEX0), module 1 to P1[4]
(CEX1), module 2 to P1[5] (CEX2), module 3 to P1[6]
(CEX3), and module 4 to P1[7] (CEX4). PCA configuration
is shown in Figure 8-1.
8.1 PCA Overview
PCA provides more timing capabilities with less CPU inter-
vention than the standard timer/counter. Its advantages
include reduced software overhead and improved accuracy.
The PCA consists of a dedicated timer/counter which
serves as the time base for an array of five compare/cap-
ture modules. Figure 8-1 shows a block diagram of the
PCA. External events associated with modules are shared
with corresponding Port 1 pins. Modules not using the port
pins can still be used for standard I/O.
Each of the five modules can be programmed in any of the
following modes:
Rising and/or falling edge capture
Software timer
High speed output
Watchdog Timer (Module 4 only)
Pulse Width Modulator (PWM)
8.2 PCA Timer/Counter
The PCA timer is a free-running 16-bit timer consisting of
registers CH and CL (the high and low bytes of the count
values). The PCA timer is common time base for all five
modules and can be programmed to run at: 1/6 the oscilla-
tor frequency, 1/2 the oscillator frequency, Timer 0 overflow,
or the input on the ECI pin (P1.2). The timer/counter source
is determined from the CPS1 and CPS0 bits in the CMOD
SFR as follows (see “PCA Timer/Counter Mode Register
FIGURE
8-1: PCA TIMER/COUNTER AND COMPARE/CAPTURE MODULES
TABLE
8-1: PCA TIMER/COUNTER SOURCE
CPS1
CPS0
12 Clock Mode
6 Clock Mode
00
fOSC /12
fOSC /6
01
fOSC /4
fOSC /2
1
0
Timer 0 overflow
1
External clock at ECI pin
(maximum rate = fOSC /8)
External clock at ECI pin
(maximum rate = fOSC /4)
T8-1.0 1228
Module 0
Module 1
Module 2
Module 3
Module 4
PCA Timer/Counter
1228 F22.0
P1.7/CEX4
P1.6/CEX3
P1.5/CEX2
P1.4/CEX1
P1.3/CEX0
16 Bits
16 Bits Each
相关PDF资料 |
PDF描述 |
|---|---|
| SSTE32882HLBAKG | SSTE SERIES, PLL BASED CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PBGA176 |
| SSTE32882HLBBKG | SSTE SERIES, PLL BASED CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PBGA176 |
| SSTUA32864EC,557 | SSTU SERIES, POSITIVE EDGE TRIGGERED D FLIP-FLOP, TRUE OUTPUT, PBGA96 |
| SSTUA32866EC/G | 32866 SERIES, POSITIVE EDGE TRIGGERED D FLIP-FLOP, COMPLEMENTARY OUTPUT, PBGA96 |
| SSTUA32866EC,557 | 32866 SERIES, POSITIVE EDGE TRIGGERED D FLIP-FLOP, COMPLEMENTARY OUTPUT, PBGA96 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SST89E554RC | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89E554RC-25-C-NI | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89E554RC-25-C-NJ | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89E554RC-25-C-PI | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89E554RC-25-C-PJ | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
发布紧急采购，3分钟左右您将得到回复。