TS87C54X2-MIA Atmel, TS87C54X2-MIA Datasheet - Page 9

IC MCU 8BIT 16K OTP 40MHZ 40-DIP

TS87C54X2-MIA

Manufacturer Part Number
TS87C54X2-MIA
Description
IC MCU 8BIT 16K OTP 40MHZ 40-DIP
Manufacturer
Atmel
Series
87Cr
Datasheet

Specifications of TS87C54X2-MIA

Core Processor
8051
Core Size
8-Bit
Speed
40/20MHz
Connectivity
UART/USART
Peripherals
POR, WDT
Number Of I /o
32
Program Memory Size
16KB (16K x 8)
Program Memory Type
OTP
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Figure 6-2.
4431E–8051–04/06
XTAL1
XTAL1:2
X2 bit
CPU clock
Mode Switching Waveforms
STD Mode
The X2 bit in the CKCON register (See Table 6-1.) allows to switch from 12 clock cycles per
instruction to 6 clock cycles and vice versa. At reset, the standard speed is activated (STD
mode). Setting this bit activates the X2 feature (X2 mode).
CAUTION
In order to prevent any incorrect operation while operating in X2 mode, user must be aware that
all peripherals using clock frequency as time reference (UART, timers) will have their time refer-
ence divided by two. For example a free running timer generating an interrupt every 20 ms will
then generate an interrupt every 10 ms. UART with 4800 baud rate will have 9600 baud rate.
X2 Mode
AT/TS8xC54/8X2
STD Mode
9

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