CMX850 查看數據表（PDF） - CML Microsystems Plc
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CMX850 Datasheet PDF : 103 Pages
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Communications Controller
1.3 Signal List
Package
L8
Pin No.
1
2
Signal
Name
VCAP
MUXAD
3
XTAL
4
XTALN
5
DVSS
6
X32K
7
X32KN
8
DVDD
9
P3.0 (RXD)
10
P3.1 (TXD)
11
P3.2 (INT0)
12
P3.3 (INT1)
13
P3.4 (T0)
14
P3.5 (T1)
15
P3.6 (PWM1)
16
P3.7 (PWM2)
17
DVSS
18
P1.0 (KBR.0)
19
P1.1 (KBR.1)
20
P1.2 (KBR.2)
21
P1.3 (KBR.3)
22
P1.4 (KBR.4)
23
P1.5 (KBR.5)
24
P1.6 (KBR.6)
25
P1.7 (KBR.7)
26
DVDD
27
P4.0 (KBC.0)
28
P4.1 (KBC.1)
29
P4.2 (KBC.2)
30
P4.3 (KBC.3)
31
P4.4 (KBC.4)
32
P4.5 (KBC.5)
33
P4.6 (KBC.6)
34
P4.7 (KBC.7)
Type
O/P
I/P
I/P
O/P
Power
I/P
O/P
Power
BI
BI
BI
BI
BI
BI
BI
BI
Power
BI
BI
BI
BI
BI
BI
BI
BI
Power
BI
BI
BI
BI
BI
BI
BI
BI
CMX850
Description
Decoupling capacitor
Multiplexed address/data bus select for external memory. Tie
to DVSS for non-multiplexed address/data. Tie to DVDD for
multiplexed address/data (frees up the D7-0 pins for alternative
functions).
The input to the 11.0592MHz or 12.288MHz oscillator circuit
from the Xtal or external clock source.
The output of the on-chip 11.0592MHz/12.288MHz Xtal
oscillator circuit.
The digital negative supply rail (ground).
The input to the 32.768kHz oscillator circuit from the Xtal.
The output of the on-chip 32.768kHz Xtal oscillator circuit. Can
also be used to output an internally derived 32.768kHz signal.
The digital positive supply rail.
Port 3 bit 0. Alternative function is serial port (RS232) receive
data.
Port 3 bit 1. Alternative function is serial port (RS232) transmit
data.
Port 3 bit 2. Alternative function is Int0 interrupt input.
Port 3 bit 3. Alternative function is Int1 interrupt input.
Port 3 bit 4. Alternative function is Timer 0 control input.
Port 3 bit 5. Alternative function is Timer 1 control input.
Port 3 bit 6. Alternative function is PWM 1 output.
Port 3 bit 7. Alternative function is PWM 2 output.
The digital negative supply rail (ground).
Port 1 bits 7-0. Alternative function is keyboard row input pins,
bits 7-0.
The digital positive supply rail.
Port 4 bits 7-0. Alternative function is keyboard column drivers,
bits 7-0. Unused column drivers remain as general-purpose
port pins.
© 2003 CML Microsystems Plc
6
D/850/6
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