C8051T627-B-GM Silicon Labs, C8051T627-B-GM Datasheet - Page 152
C8051T627-B-GM
Manufacturer Part Number
C8051T627-B-GM
Description
8-bit Microcontrollers - MCU UBS, 64K OTP MCU
Manufacturer
Silicon Labs
Datasheet
1.C8051T626-B-GM.pdf
(298 pages)
Specifications of C8051T627-B-GM
Rohs
yes
Core
8051
Processor Series
C8051T627
Data Bus Width
8 bit
Maximum Clock Frequency
48 MHz
Program Memory Size
64 KB
Data Ram Size
3328 B
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 5.25 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
QFN-32
Mounting Style
SMD/SMT
Program Memory Type
EPROM
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C8051T620/1/6/7 & C8051T320/1/2/3
22.6. Special Function Registers for Accessing and Configuring Port I/O
All Port I/O are accessed through corresponding special function registers (SFRs) that are both byte
addressable and bit addressable. When writing to a Port, the value written to the SFR is latched to main-
tain the output data value at each pin. When reading, the logic levels of the Port's input pins are returned
regardless of the XBRn settings (i.e., even when the pin is assigned to another signal by the Crossbar, the
Port register can always read its corresponding Port I/O pin). The exception to this is the execution of the
read-modify-write instructions that target a Port Latch register as the destination. The read-modify-write
instructions when operating on a Port SFR are the following: ANL, ORL, XRL, JBC, CPL, INC, DEC, DJNZ
and MOV, CLR or SETB, when the destination is an individual bit in a Port SFR. For these instructions, the
value of the latch register (not the pin) is read, modified, and written back to the SFR.
Each Port has a corresponding PnSKIP register which allows its individual Port pins to be assigned to dig-
ital functions or skipped by the Crossbar. All Port pins used for analog functions or GPIO should have their
PnSKIP bit set to 1.
The Port input mode of the I/O pins is defined using the Port Input Mode registers (PnMDIN). Each Port
cell can be configured for analog or digital I/O. This selection is required even for the digital resources
selected in the XBRn registers, and is not automatic. The only exception to this is P3.0, which can only be
used for digital I/O.
The output driver characteristics of the I/O pins are defined using the Port Output Mode registers (PnMD-
OUT). Each Port Output driver can be configured as either open drain or push-pull. This selection is
required even for the digital resources selected in the XBRn registers, and is not automatic. The only
exception to this is the SMBus (SDA, SCL) pins, which are configured as open-drain regardless of the
PnMDOUT settings.
SFR Definition 22.8. P0: Port 0
SFR Address = 0x80; Bit-Addressable
152
Name
Reset
7:0
Bit
Type
Bit
P0[7:0]
Name
7
1
Port 0 Data.
Sets the Port latch logic
value or reads the Port pin
logic state in Port cells con-
figured for digital I/O.
6
1
Description
5
1
Rev. 1.2
0: Set output latch to logic
LOW.
1: Set output latch to logic
HIGH.
4
1
P0[7:0]
R/W
Write
3
1
2
1
0: P0.n Port pin is logic
LOW.
1: P0.n Port pin is logic
HIGH.
1
1
Read
0
1
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