AT83C5136 Atmel Corporation, AT83C5136 Datasheet - Page 34
AT83C5136
Manufacturer Part Number
AT83C5136
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT83C5134.pdf
(166 pages)
Specifications of AT83C5136
Max. Operating Frequency
32 MHz
Cpu
8051-12C
Max I/o Pins
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
1
Sram (kbytes)
1.25
Eeprom (bytes)
512
Operating Voltage (vcc)
2.7 to 3.6
Timers
4
Mask Rom (kbytes)
32
Watchdog
Yes
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Figure 12-1. Auto-reload Mode Up/Down Counter (DCEN = 1)
12.2
34
Programmable Clock Output
AT83C5134/35/36
F
CLK PERIPH
In the Clock-out mode, Timer 2 operates as a 50%-duty-cycle, programmable clock generator
(See Figure 12-2). The input clock increments TL2 at frequency F
edly counts to overflow from a loaded value. At overflow, the contents of RCAP2H and RCAP2L
registers are loaded into TH2 and TL2. In this mode, Timer 2 overflows do not generate inter-
rupts. The following 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
(P1.0).
Timer 2 is programmed for the Clock-out mode as follows:
• 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
• Enter a 16-bit initial value in timer registers TH2/TL2. It can be the same as the reload value
• To start the timer, set TR2 run control bit in T2CON register.
CLK PERIPH
registers.
or a different one depending on the application.
/2
16)
to 4 MHz (F
Clock OutFrequency
: 6
–
(UP COUNTING RELOAD VALUE)
(DOWN COUNTING RELOAD VALUE)
CLK PERIPH
RCAP2L
T2
(8-bit)
(8-bit)
(8-bit)
TL2
FFh
/4). The generated clock signal is brought out to T2 pin
T2CON
RCAP2H
=
C/T2
(8-bit)
(8-bit)
TH2
(8-bit)
0
FFh
1
---------------------------------------------------------------------------------------- -
4
×
(
65536 RCAP2H
T2CON
TR2
F
–
CLKPERIPH
T2EX:
if DCEN = 1, 1 = UP
if DCEN = 1, 0 = DOWN
if DCEN = 0, up counting
T2CON
TOGGLE
TF2
CLK PERIPH
⁄
RCAP2L
T2CON
EXF2
INTERRUPT
Timer 2
/2. The timer repeat-
)
7683C–USB–11/07
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