
2
T89C5115
4128A–8051–04/02
In X2 mode a maximum external clock rate of 20 MHz reaches a 300 ns cycle time.
Block Diagram
Notes: 1. 8 analog Inputs/8 Digital I/O
2. 2-Bit I/O Port
Timer 0
INT
RAM
256x8
T0
T1
RxD
TxD
XTAL2
XTAL1
UART
CPU
Timer 1
INT1
Ctrl
INT0
C51
CORE
P2
(2)
Port 1
Port 2
Port 3
Parallel I/O Ports & Ext. Bus
P1
(1)
P3
ERAM
256x8
IB-bus
PCA
RESET
Watch
Dog
PCA
ECI
Vss
Vcc
Timer2
T2EX
T2
Port 4
P4(2)
10-bit
ADC
Flash
16kx8
Boot
loader
2kx8
EEPROM
2kx8
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