TS87C51RD2-VCE Atmel, TS87C51RD2-VCE Datasheet - Page 48
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TS87C51RD2-VCE
Manufacturer Part Number
TS87C51RD2-VCE
Description
IC MCU 8BIT 64K OTP 40MHZ 44VQFP
Manufacturer
Atmel
Series
87Cr
Specifications of TS87C51RD2-VCE
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
0°C ~ 70°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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Part Number
Manufacturer
Quantity
Price
6.9
48
ONCE
AT/TS8xC51Rx2
TM
Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS8xC51Rx2 without
removing the circuit from the board. The ONCE mode is invoked by driving certain pins of the
TS80C51Rx2; the following sequence must be exercised:
While the TS80C51Rx2 is in ONCE mode, an emulator or test CPU can be used to drive the cir-
cuit Table 26. shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 6-23.
• Pull ALE low while the device is in reset (RST high) and PSEN is high.
• Hold ALE low as RST is deactivated.
Weak pull-up
ALE
External Pin Status during ONCE Mode
Weak pull-up
PSEN
Port 0
Float
Weak pull-up
Port 1
Weak pull-up
Port 2
Weak pull-up
Port 3
4188F–8051–01/08
XTAL1/2
Active