Rainbow Electronics T89C5115 - Manual (Page 2)

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
Rx
D
Tx
D
XTAL2
XTAL1
UART
CPU
Timer 1
INT
1
Ctrl
INT
0
C51
CORE
P2
(2
)
Port 1 Port 2 Port 3
Parallel I/O Ports & Ext. Bus
P1
(1
)
P3
ERAM
256x8
IB-bus
PCA
RE
S
E
T
Watch
Dog
PC
A
EC
I
Vs
s
Vc
c
Timer2
T2
E
X
T2
Port 4
P4
(2
)
10-bit
ADC
Flash
16kx8
Boot
loader
2kx8
EEPROM
2kx8