C8051F531-IT Silicon Laboratories Inc, C8051F531-IT Datasheet - Page 118
![IC 8051 MCU 8K FLASH 20TSSOP](/photos/12/46/124608/silicon_laboratories_inc-20-tssop_sml.jpg)
C8051F531-IT
Manufacturer Part Number
C8051F531-IT
Description
IC 8051 MCU 8K FLASH 20TSSOP
Manufacturer
Silicon Laboratories Inc
Series
C8051F53xr
Specifications of C8051F531-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
8KB (8K 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
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
SPI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
16
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.25 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit, 16 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Other names
336-1393
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F531-IT
Manufacturer:
SILICON
Quantity:
205
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C8051F52x/F52xA/F53x/F53xA
SFR Definition 12.1. PSCTL: Program Store R/W Control
SFR Definition 12.2. FLKEY: Flash Lock and Key
118
Bits7–2: UNUSED: Read = 000000b, Write = don’t care.
Bit1:
Bit0:
Bits7–0: FLKEY: Flash Lock and Key Register
R/W
Bit7
Bit7
—
R
PSEE: Program Store Erase Enable
Setting this bit (in combination with PSWE) allows an entire page of Flash program memory
to be erased. If this bit is logic 1 and Flash writes are enabled (PSWE is logic 1), a write to
Flash memory using the MOVX instruction will erase the entire page that contains the loca-
tion addressed by the MOVX instruction. The value of the data byte written does not matter.
0: Flash program memory erasure disabled.
1: Flash program memory erasure enabled.
PSWE: Program Store Write Enable
Setting this bit allows writing a byte of data to the Flash program memory using the MOVX
write instruction. The Flash location should be erased before writing data.
0: Writes to Flash program memory disabled.
1: Writes to Flash program memory enabled; the MOVX write instruction targets Flash
memory.
Write:
This register provides a lock and key function for Flash erasures and writes. Flash writes
and erases are enabled by writing 0xA5 followed by 0xF1 to the FLKEY register. Flash
writes and erases are automatically disabled after the next write or erase is complete. If any
writes to FLKEY are performed incorrectly, or if a Flash write or erase operation is attempted
while these operations are disabled, the Flash will be permanently locked from writes or era-
sures until the next device reset. If an application never writes to Flash, it can intentionally
lock the Flash by writing a non-0xA5 value to FLKEY from software.
Read:
When read, bits 1–0 indicate the current Flash lock state.
00: Flash is write/erase locked.
01: The first key code has been written (0xA5).
10: Flash is unlocked (writes/erases allowed).
11: Flash writes/erases disabled until the next reset.
R/W
Bit6
Bit6
—
R
R/W
Bit5
Bit5
—
R
R/W
Bit4
Bit4
—
R
Rev. 1.3
R/W
Bit3
Bit3
—
R
R/W
Bit2
Bit2
—
R
PSEE
R/W
R/W
Bit1
Bit1
SFR Address:
SFR Address:
PSWE
R/W
Bit0
R/W
Bit0
00000000
Reset Value
00000000
Reset Value
0x8F
0xB7
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