Rainbow Electronics AT89C5122 - Manual (Page 5)

5
AT8xC5122/23
4202E–SCR–06/06
AT8xC5122 Block Diagram
AT83C5123 Block Diagram
DC/DC
Conv erter
LI CV
CC
C
VSS
UART
Interf ace
Tx
D
Rx
D
16-BIT
TIMERS
T[
0
-1
]
Interrupt
Controller
IN
T
[0-
1]
Alternate
Card
CR
S
T
1
CC
L
K
1
CI
O
1
3.3 V
Regulator
VC
C
VSS
WATCH-DOG
POR
PFD
RESET
RST
PLL PLLF
XTAL1
XTAL2
8 MHz
Oscillator
256 x 8
RAM
512 x 8
XRAM
80C
51
8-
B
IT
CO
RE
256 x 8
RAM
INTERNAL ADDRESS AND DATA BUS
32K x 8
ROM (1)
32K x 8
E2PROM (1)
32K x 8
CRAM (1)
External Memory
Controller
EA
PSEN
AL
E
A[
8
-1
5
]
AD
[0
-7
]
WR RD D+ D-
VR
EF
USB
Interf ace
IS
O
7816
In
te
rf
a
c
e
CCLK
CRST
CPRES
CC8
CC4
CIO
3.3V
Regulator
AVSS AVC
C
DV
CC
Note 1 : the implementation of these f eatures depends on product v ersions
512 x 8
E2PROM (1)
Parallel I/O Ports
P0
[0
-7
]
8-BIT
PORT
8-BIT
PORT
P2
[0
-7
]
8-BIT
PORT
P3
[0
-7
]
6-BIT
PORT
P4
[0
-5
]
8-BIT
PORT
P5
[0
-7
]
LED's
LE
D
[0-
6]
3-BIT
PORT
P
1
[2
,6
-7
]
SPI
Interf ace
MI
S
O
MO
SI
SC
K
SS
KBD
Interf ace
KB
[0
-7
]
DC/DC
Conv erter
LI CV
C
C
C
VSS
UART
Interf ace
Tx
D
Rx
D
16-BIT
TIMERS
T[
0
-1
]
Interrupt
Controller
IN
T
[0
-1
]
Alternate
Card
CR
S
T
1
CCL
K
1
CI
O
1
3.3 V
Regulator
VC
C
VS
S
WATCH-DOG
POR
PFD
RESET
RST
PLL PLLF
XTAL1
XTAL2
8 MHz
Oscillator
256 x 8
RAM
512 x 8
XRAM
80
C
5
1
8-
B
IT
CO
RE
256 x 8
RAM
INTERNAL ADDRESS AND DATA BUS
30K x 8
ROM
512 x 8
E2PROM (1)
Parallel I/O Ports
8-BIT
PORT
P3
[0
-7
]
D+ D-
VR
EF
USB
Interf ace
IS
O
78
16
In
te
rf
a
c
e
CCLK
CRST
CPRES
CC8
CC4
CIO
3.3V
Regulator
AVSS AVC
C
DV
C
C
Note 1 : the implementation of these f eatures depends on product v ersions
1-BIT
PORT
P5
.0
LED's
LE
D
[0-
3
]
3-BIT
PORT
P
1
[2
,6
-7
]