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SST89E554RC-40-I-TQJ Datasheet(PDF) 48 Page - Silicon Storage Technology, Inc

No. de pieza SST89E554RC-40-I-TQJ
Descripción Electrónicos  FlashFlex51 MCU
Download  86 Pages
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Fabricante Electrónico  SST [Silicon Storage Technology, Inc]
Página de inicio  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST89E554RC-40-I-TQJ Datasheet(HTML) 48 Page - Silicon Storage Technology, Inc

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Data Sheet
FlashFlex51 MCU
SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC
©2003 Silicon Storage Technology, Inc.
S71207-04-000
12/03
8.0 PROGRAMMABLE COUNTER ARRAY
The Programmable Counter Array (PCA) present on the
SST89E/V554RC and SST89E/V564RD 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 programmed as a Watchdog Timer in addi-
tion to the other four modes. Each module has a pin asso-
ciated 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
(CMOD)” on page 26):
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
Timer 0 overflow
1
1
External clock at ECI pin
(maximum rate = fOSC /8)
External clock at ECI pin
(maximum rate = fOSC /4)
T8-1.0 1207
Module 0
Module 1
Module 2
Module 3
Module 4
PCA Timer/Counter
1207 F34.0
P1.7/CEX4
P1.6/CEX3
P1.5/CEX2
P1.4/CEX1
P1.3/CEX0
16 Bits
16 Bits Each


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