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| 型号： | SST89V54RDA-33-C-QIF |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, QCC40 |
| 封装： | ROHS COMPLIANT, MO-220IWJJD-5, WQFN-40 |
| 文件页数： | 44/84页 |
| 文件大小： | 1755K |
| 代理商： | SST89V54RDA-33-C-QIF |
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Data Sheet
FlashFlex MCU
SST89E54RD2A/RDA / SST89E58RD2A/RDA
SST89V54RD2A/RDA / SST89V58RD2A/RDA
49
2007 Silicon Storage Technology, Inc.
S71339-01-000
1/07
8.0 PROGRAMMABLE COUNTER ARRAY
The Programmable Counter Array (PCA) present on the
SST89E/V5xRD2A/RDA 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 out-
put, 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 1339
Module 0
Module 1
Module 2
Module 3
Module 4
PCA Timer/Counter
1339 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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相关代理商/技术参数 |
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|---|---|
| SST89V554 | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89V554-25-C-NI | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89V554-25-C-NJ | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89V554-25-C-PI | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89V554-25-C-PJ | 制造商:SST 制造商全称:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
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