EVAL-ADUC832QSZ Analog Devices Inc, EVAL-ADUC832QSZ Datasheet - Page 55

• Manufacturer Part Number: EVAL-ADUC832QSZ
• Description: KIT DEV FOR ADUC832 QUICK START
• Manufacturer: Analog Devices Inc
• Series: QuickStart™ Kitr
• Type: MCUr

Specifications of EVAL-ADUC832QSZ

• Contents: Evaluation Board, Cable, Power Supply, Software and Documentation
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ADuC832
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: EVAL-ADUC832QS; EVAL-ADUC832QS

Timer/Counter Operation Modes
The following paragraphs describe the operating modes for
Timer/Counter 2. The operating modes are selected by bits in the
T2CON SFR as shown in Table XXIII.
RCLK (or) TCLK
0
0
1
X
16-Bit Autoreload Mode
In Autoreload mode, there are two options, which are selected
by bit EXEN2 in T2CON. If EXEN2 = 0, then when Timer 2
rolls over it not only sets TF2 but also causes the Timer 2 registers
to be reloaded with the 16-bit value in registers RCAP2L and
RCAP2H, which are preset by software. If EXEN2 = 1, then
Timer 2 still performs the above, but with the added feature
that a 1-to-0 transition at external input T2EX will also trigger
the 16-bit reload and set EXF2. The Autoreload mode is illus-
trated in Figure 49.
REV. 0
Table XXIII. T2CON Operating Modes
*CORE CLK IS DEFINED BY THE CD BITS IN PLLCON
T2EX
*CORE CLK IS DEFINED BY THE CD BITS IN PLLCON
T2EX
CAP2
0
1
X
X
PIN
PIN
PIN
PIN
CORE
CORE
CLK*
CLK*
T2
T2
TRANSITION
TRANSITION
DETECTOR
DETECTOR
12
12
TR2
1
1
1
0
Figure 49. Timer/Counter 2, 16-Bit Autoreload Mode
Figure 50. Timer/Counter 2, 16-Bit Capture Mode
C/ T2 = 0
C/ T2 = 1
C/ T2 = 0
C/T2 = 1
Mode
16-Bit Autoreload
16-Bit Capture
Baud Rate
OFF
EXEN2
EXEN2
CONTROL
CONTROL
TR2
TR2
CONTROL
CONTROL
RELOAD
CAPTURE
–55–
RCAP2L
RCAP2L
(8 BITS)
(8 BITS)
TL2
TL2
16-Bit Capture Mode
In the Capture mode, there are again two options, which are
selected by bit EXEN2 in T2CON. If EXEN2 = 0, then Timer 2
is a 16-bit timer or counter that, upon overflowing, sets bit TF2,
the Timer 2 overflow bit, which can be used to generate an
interrupt. If EXEN2 = 1, then Timer 2 still performs the above,
but a l-to-0 transition on external input T2EX causes the current
value in the Timer 2 registers, TL2 and TH2, to be captured
into registers RCAP2L and RCAP2H, respectively. In addition, the
transition at T2EX causes bit EXF2 in T2CON to be set, and
EXF2, like TF2, can generate an interrupt. The Capture mode
is illustrated in Figure 50.
The baud rate generator mode is selected by RCLK = 1 and/or
TCLK = 1.
In either case, if Timer 2 is being used to generate the baud
rate, the TF2 interrupt flag will not occur. Therefore, Timer 2
interrupts will not occur so they do not have to be disabled. In
this mode the EXF2 flag, however, can still cause interrupts and
this can be used as a third external interrupt.
Baud rate generation will be described as part of the UART
serial port operation in the following pages.
RCAP2H
RCAP2H
(8 BITS)
(8 BITS)
TH2
TH2
EXF2
EXF2
TF2
TF2
TIMER
INTERRUPT
TIMER
INTERRUPT
ADuC832