AT87C52X2-3CSUL Atmel, AT87C52X2-3CSUL Datasheet - Page 12
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AT87C52X2-3CSUL
Manufacturer Part Number
AT87C52X2-3CSUL
Description
IC 8051 MCU 8K OTP 30MHZ 40DIP
Manufacturer
Atmel
Series
87Cr
Datasheet
1.TS87C52X2-VCA.pdf
(55 pages)
Specifications of AT87C52X2-3CSUL
Core Processor
8051
Core Size
8-Bit
Speed
30/20MHz
Connectivity
UART/USART
Peripherals
POR
Number Of I /o
32
Program Memory Size
8KB (8K x 8)
Program Memory Type
OTP
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
UART
Maximum Clock Frequency
60 MHz
Number Of Programmable I/os
32
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
Through Hole
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
Timer 2
Auto-reload Mode
12
TS8xCx2X2
The timer 2 in the
It is a 16-bit timer/counter: the count is maintained by two eight-bit timer registers, TH2
and TL2, connected in cascade. It is controlled by T2CON register (See Table 5) and
T2MOD register (See Table 6). Timer 2 operation is similar to Timer 0 and Timer 1. C/T2
selects F
clock input. Setting TR2 allows TL2 to be incremented by the selected input.
Timer 2 has 3 operating modes: capture, autoreload and Baud Rate Generator. These
modes are selected by the combination of RCLK, TCLK and CP/RL2 (T2CON), as
described in the Atmel 8-bit Microcontroller Hardware description.
Refer to the Atmel 8-bit Microcontroller Hardware description for the description of Cap-
ture and Baud Rate Generator Modes.
In
•
•
The Auto-reload mode configures timer 2 as a 16-bit timer or event counter with auto-
matic reload. If DCEN bit in T2MOD is cleared, timer 2 behaves as in 80C52 (refer to the
Atmel 8-bit Microcontroller Hardware description). If DCEN bit is set, timer 2 acts as an
Up/down timer/counter as shown in Figure 4. In this mode the T2EX pin controls the
direction of count.
When T2EX is high, timer 2 counts up. Timer overflow occurs at FFFFh which sets the
TF2 flag and generates an interrupt request. The overflow also causes the 16-bit value
in RCAP2H and RCAP2L registers to be loaded into the timer registers TH2 and TL2.
When T2EX is low, timer 2 counts down. Timer underflow occurs when the count in the
timer registers TH2 and TL2 equals the value stored in RCAP2H and RCAP2L registers.
The underflow sets TF2 flag and reloads FFFFh into the timer registers.
The EXF2 bit toggles when timer 2 overflows or underflows according to the the direc-
tion of the count. EXF2 does not generate any interrupt. This bit can be used to provide
17-bit resolution.
TS80C52X2
Auto-reload mode with up or down counter
Programmable clock-output
OSC
/12 (timer operation) or external pin T2 (counter operation) as the timer
Timer 2 includes the following enhancements:
TS80C52X2
is compatible with the timer 2 in the 80C52.
4184G–8051–09/06