C8051F700-GQR Silicon Laboratories Inc, C8051F700-GQR Datasheet - Page 180
C8051F700-GQR
Manufacturer Part Number
C8051F700-GQR
Description
MCU 8-Bit C8051F70x 8051 CISC 15KB Flash 1.8V/3V 64-Pin TQFP T/R
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F700DK.pdf
(306 pages)
Specifications of C8051F700-GQR
Package
64TQFP
Device Core
8051
Family Name
C8051F70x
Maximum Speed
25 MHz
Ram Size
512 Byte
Program Memory Size
15 KB
Operating Supply Voltage
1.8|3 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
54
Interface Type
I2C/SMBus/SPI/UART
On-chip Adc
16-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
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C8051F70x/71x
28. Port Input/Output
Digital and analog resources are available through 64 I/O pins. Each of the Port pins P0.0–P2.7 can be
defined as general-purpose I/O (GPIO), assigned to one of the internal digital resources, or assigned to an
analog function as shown in Figure 28.4. The designer has complete control over which functions are
assigned, limited only by the number of physical I/O pins. This resource assignment flexibility is achieved
through the use of a Priority Crossbar Decoder. The state of a Port I/O pin can always be read in the corre-
sponding Port latch, regardless of the Crossbar settings.
The Crossbar assigns the selected internal digital resources to the I/O pins based on the Priority Decoder.
The registers XBR0 and XBR1, defined in SFR Definition 28.1 and SFR Definition 28.2, are used to select
internal digital functions.
All Port I/Os except P0.3 are tolerant of voltages up to 2 V above the V
the Port cell circuit). The Port I/O cells are configured as either push-pull or open-drain in the Port Output
Mode registers (PnMDOUT, where n = 0,1). Complete Electrical Specifications for Port I/O are given in
Section “9. Electrical Characteristics” on page 47.
180
H ighest
P riority
Low est
P riority
S Y SC LK
O utputs
SM Bus
T0, T1
U AR T
P 0
P 1
PC A
C P0
S PI
(P0.0-P 0.7)
(P1.0-P 1.7)
Figure 28.1. Port I/O Functional Block Diagram
2
4
2
2
4
2
8
8
(A D C 0, C P0, V R E F, XTAL)
To Analog Peripherals
Rev. 1.0
P nS K IP R egisters
X BR 0, XB R1,
C rossbar
Decoder
Priority
Digital
To C S0
8
8
8
P 0M AS K , P0M A T
P 1M AS K , P1M A T
Port M atch
DD
C ells
C ells
C ells
C ells
C ells
C ells
C ells
supply (refer to Figure 28.2 for
I/O
I/O
I/O
I/O
I/O
I/O
P1
I/O
P 2
P3
P4
P5
P 6
P0
External Interrupts
PnM D IN , P nD R V
EX0 and E X1
PnM D O U T,
R egisters
P4.0
P4.7
P5.0
P5.7
P0.0
P0.7
P1.0
P1.7
P2.0
P2.7
P3.0
P3.7
P6.0
P6.5
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