C8051F317-GMR Silicon Laboratories Inc, C8051F317-GMR Datasheet - Page 116

• Manufacturer Part Number: C8051F317-GMR
• Description: MCU 8-Bit C8051F31x 8051 CISC 16KB Flash 3.3V 24-Pin QFN EP T/R
• Manufacturer: Silicon Laboratories Inc

Specifications of C8051F317-GMR

• Package: 24QFN EP
• Device Core: 8051
• Family Name: C8051F31x
• Maximum Speed: 25 MHz
• Ram Size: 1.25 KB
• Program Memory Size: 16 KB
• Operating Supply Voltage: 3.3 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 21
• Interface Type: I2C/SMBus/SPI/UART
• On-chip Adc: 17-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4

C8051F310/1/2/3/4/5/6/7
10.4.3. System Clock
Additional Flash recommendations and example code can be found in AN201, "Writing to Flash from Firm-
ware", available from the Silicon Laboratories web site.
116
Bits7–2: UNUSED: Read = 000000b, Write = don’t care.
Bit1:
Bit0:
R/W
Bit7
-
10. Make certain that the Flash write and erase pointer variables are not located in XRAM. See
11. Add address bounds checking to the routines that write or erase Flash memory to ensure that
12. If operating from an external crystal, be advised that crystal performance is susceptible to
13. If operating from the external oscillator, switch to the internal oscillator during Flash write or
your compiler documentation for instructions regarding how to explicitly locate variables in dif-
ferent memory areas.
a routine called with an illegal address does not result in modification of the Flash.
electrical interference and is sensitive to layout and to changes in temperature. If the system is
operating in an electrically noisy environment, use the internal oscillator or use an external
CMOS clock.
erase operations. The external oscillator can continue to run, and the CPU can switch back to
the external oscillator after the Flash operation has completed.
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.
SFR Definition 10.1. PSCTL: Program Store R/W Control
R/W
Bit6
-
R/W
Bit5
-
R/W
Bit4
-
Rev. 1.7
R/W
Bit3
-
R/W
Bit2
-
PSEE
R/W
Bit1
PSWE
R/W
Bit0
SFR Address:
00000000
Reset Value
0x8F