C8051F537-IT Silicon Laboratories Inc, C8051F537-IT Datasheet - Page 119
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C8051F537-IT
Manufacturer Part Number
C8051F537-IT
Description
IC 8051 MCU 2K FLASH 20TSSOP
Manufacturer
Silicon Laboratories Inc
Series
C8051F53xr
Specifications of C8051F537-IT
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
16
Program Memory Size
2KB (2K x 8)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.25 V
Data Converters
A/D 16x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
20-TSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Other names
336-1401
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F537-IT
Manufacturer:
Silicon Labs
Quantity:
135
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13. Port Input/Output
Digital and analog resources are available through up to 16 I/O pins. Port pins are organized as two or one
byte-wide Ports. Each of the Port pins can be defined as general-purpose I/O (GPIO) or analog input/out-
put; Port pins P0.0 - P2.7 can be assigned to one of the internal digital resources as shown in Figure 13.3.
The designer has complete control over which functions are assigned, limited only by the number of phys-
ical I/O pins. This resource assignment flexibility is achieved through the use of a Priority Crossbar
Decoder. Note that the state of a Port I/O pin can always be read in the corresponding Port latch, regard-
less of the Crossbar settings.
The Crossbar assigns the selected internal digital resources to the I/O pins based on the peripheral priority
order of the Priority Decoder (Figure 13.3 and Figure 13.4). The registers XBR0 and XBR1, defined in SFR
Definition 13.1 and SFR Definition 13.2, are used to select internal digital functions.
Port I/O pins are 5.25 V tolerant over the operating range of V
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 Table 2.9 on
page 33.
Highest
Lowest
Priority
Priority
SYSCLK
Outputs
T0, T1
UART
P0
P1
PCA
CP0
SPI
LIN
(P0.0-P0.7)
(P1.0-P1.7*)
Figure 13.1. Port I/O Functional Block Diagram
2
4
2
7
2
8
8
2
C8051F52x/F52xA/F53x/F53xA
Rev. 1.3
PnSKIP Registers
XBR0, XBR1,
Crossbar
Decoder
Priority
Digital
REGIN
. Figure 13.2 shows the Port cell circuit.
8
8
P0MASK, P0MATCH
P1MASK, P1MATCH
Registers
Cells
Cells
I/O
P0
P1
I/O
available on C8051F53x/
P1.0–1.7 and P0.7
C8051F53xA parts
PnMDIN Registers
PnMDOUT,
P0.0
P0.7
P1.7
P1.0
119
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