C8051F902-GM Silicon Laboratories Inc, C8051F902-GM Datasheet - Page 108

• Manufacturer Part Number: C8051F902-GM
• Description: IC MCU 8BIT 8KB FLASH 24QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F9xxr

Specifications of C8051F902-GM

• Program Memory Type: FLASH
• Program Memory Size: 8KB (8K x 8)
• Package / Case: 24-QFN
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 0.9 V ~ 3.6 V
• Data Converters: A/D 15x10/12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F9x
• Core: 8051
• Data Ram Size: 768 B
• Interface Type: UART
• Maximum Clock Frequency: 25 MHz
• Number Of Timers: 4
• Operating Supply Voltage: 0.9 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F912DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit
• Package: 24QFN EP
• Device Core: 8051
• Family Name: C8051F90x
• Maximum Speed: 25 MHz
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1848-5

C8051F91x-C8051F90x
9.1.
The CIP-51 core has a 64 kB program memory space. The C8051F91x-C8051F90x devices implement
16 kB (C8051F912/1) or 8 kB (C8051F902/1) of this program memory space as in-system, re-
programmable Flash memory, organized in a contiguous block from addresses 0x0000 to 0x3BFF
(C8051F912/1) or 0x1FFF (C8051F902/1). The last byte of this contiguous block of addresses serves as
the security lock byte for the device. Any addresses above the lock byte are reserved.
9.1.1. MOVX Instruction and Program Memory
The MOVX instruction in an 8051 device is typically used to access external data memory. On the
C8051F91x-C8051F90x devices, the MOVX instruction is normally used to read and write on-chip XRAM,
but can be re-configured to write and erase on-chip Flash memory space. MOVC instructions are always
used to read Flash memory, while MOVX write instructions are used to erase and write Flash. This Flash
access feature provides a mechanism for the C8051F91x-C8051F90x to update program code and use
the program memory space for non-volatile data storage. Refer to Section “13. Flash Memory” on
page 132 for further details.
9.2.
The C8051F91x-C8051F90x device family include 768 bytes of RAM data memory. 256 bytes of this
memory is mapped into the internal RAM space of the 8051. The remainder of this memory is on-chip
“external” memory. The data memory map is shown in Figure 9.1 for reference.
9.2.1. Internal RAM
There are 256 bytes of internal RAM mapped into the data memory space from 0x00 through 0xFF. The
lower 128 bytes of data memory are used for general purpose registers and scratch pad memory. Either
direct or indirect addressing may be used to access the lower 128 bytes of data memory. Locations 0x00
through 0x1F are addressable as four banks of general purpose registers, each bank consisting of eight
byte-wide registers. The next 16 bytes, locations 0x20 through 0x2F, may either be addressed as bytes or
as 128 bit locations accessible with the direct addressing mode.
The upper 128 bytes of data memory are accessible only by indirect addressing. This region occupies the
same address space as the Special Function Registers (SFR) but is physically separate from the SFR
space. The addressing mode used by an instruction when accessing locations above 0x7F determines
108
C8051F912/1
C8051F902/1
(Data Only)
Scratchpad
(SFLE=1)
Program Memory
Data Memory
0x01FF
0x0000
Figure 9.2. Flash Program Memory Map
Flash Memory Space
Lock Byte Page
Reserved Area
C8051F912/1
Lock Byte
(SFLE=0)
Rev. 1.0
0xFFFF
0x3C00
0x3BFF
0x3BFE
0x3A00
0x39FF
0x0000
Flash Memory Space
Lock Byte Page
Address Space
C8051F902/1
Unpopulated
(Reserved)
(SFLE=0)
Lock Byte
0xFFFF
0x8000
0x1FFF
0x1FFE
0x1E00
0x1BFF
0x0000