TS87C51RD2-VIE Atmel, TS87C51RD2-VIE Datasheet - Page 19
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TS87C51RD2-VIE
Manufacturer Part Number
TS87C51RD2-VIE
Description
IC MCU 8BIT 64K OTP 40MHZ 44VQFP
Manufacturer
Atmel
Series
87Cr
Specifications of TS87C51RD2-VIE
Core Processor
8051
Core Size
8-Bit
Speed
40/30MHz
Connectivity
UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (64K x 8)
Program Memory Type
OTP
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Available stocks
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Manufacturer
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6.4.2. Programmable Clock-Output
In the clock-out mode, timer 2 operates as a 50%-duty-cycle, programmable clock generator (See Figure 6) . The
input clock increments TL2 at frequency F
At overflow, the contents of RCAP2H and RCAP2L registers are loaded into TH2 and TL2. In this mode, timer
2 overflows do not generate interrupts. The formula gives the clock-out frequency as a function of the system
oscillator frequency and the value in the RCAP2H and RCAP2L registers :
For a 16 MHz system clock, timer 2 has a programmable frequency range of 61 Hz
(F
Timer 2 is programmed for the clock-out mode as follows:
Rev. C - 06 March, 2001
OSC
Set T2OE bit in T2MOD register.
Clear C/T2 bit in T2CON register.
Determine the 16-bit reload value from the formula and enter it in RCAP2H/RCAP2L registers.
Enter a 16-bit initial value in timer registers TH2/TL2. It can be the same as the reload value or a different
one depending on the application.
To start the timer, set TR2 run control bit in T2CON register.
/2
16)
to 4 MHz (F
XTAL1
Clock OutFrequency
F
OSC
Figure 5. Auto-Reload Mode Up/Down Counter (DCEN = 1)
XTAL
/4). The generated clock signal is brought out to T2 pin (P1.0).
–
OSC
F
OSC
/2. The timer repeatedly counts to overflow from a loaded value.
=
--------------------------------------------------------------------------------------
4
(UP COUNTING RELOAD VALUE)
(:6 in X2 mode)
(DOWN COUNTING RELOAD VALUE)
65536 RCAP2H
T2
:
12
RCAP2L
(8-bit)
(8-bit)
(8-bit)
TL2
FFh
–
F
T2CONreg
osc
RCAP2H
C/T2
(8-bit)
(8-bit)
TH2
(8-bit)
0
FFh
1
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
RCAP2L
T2CONreg
TR2
TS80C51RA2/RD2
T2EX:
if DCEN=1, 1=UP
if DCEN=1, 0=DOWN
if DCEN = 0, up counting
T2CONreg
TOGGLE
TF2
T2CONreg
EXF2
INTERRUPT
TIMER 2
19