C8051F018-GQR Silicon Laboratories Inc, C8051F018-GQR Datasheet - Page 74

• Manufacturer Part Number: C8051F018-GQR
• Description: IC 8051 MCU 16K FLASH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F018r

Specifications of C8051F018-GQR

• 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: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.8 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Processor Series: C8051F0x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1.25 KB
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 4 bit
• Operating Supply Voltage: 2.8 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: C8051F005DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

10. EXTERNAL RAM
The C8051F018/9 includes 1024 bytes of RAM mapped into the external data memory space. All of these address
locations may be accessed using the external move instruction (MOVX) and the data pointer (DPTR), or using
MOVX indirect addressing mode. If the MOVX instruction is used with an 8-bit address operand (such as @R1),
then the high byte of the 16-bit address is provided by the External Memory Interface Control Register (EMI0CN as
shown in Figure 10.1). Note: the MOVX instruction is also used for writes to the Flash memory. See Section
9 for details. The MOVX instruction accesses XRAM by default (i.e. PSTCL.0 = 0).
For any of the addressing modes the upper 5-bits of the 16-bit external data memory address word are “don’t cares”.
As a result, the 1024-byte RAM is mapped modulo style over the entire 64k external data memory address range.
For example, the XRAM byte at address 0x0000 is also at address 0x0400, 0x0800, 0x0C00, 0x1000, etc. This is a
useful feature when doing a linear memory fill, as the address pointer doesn’t have to be reset when reaching the
RAM block boundary.
Bits 7-2: Not Used – reads 000000b
Bits 1-0: PGSEL[1:0]: XRAM Page Select Bits
Bit7
R
-
The XRAM Page Select Bits provide the high byte of the 16-bit external data memory
address when using an 8-bit MOVX command, effectively selecting a 256-byte page of
RAM. The upper 6-bits are “don’t cares”, so the 1k address blocks are repeated modulo
over the entire 64k external data memory address space.
00: xxxxxx00b
01: xxxxxx01b
10: xxxxxx10b
11: xxxxxx11b
Bit6
R
-
Figure 10.1. EMI0CN: External Memory Interface Control
Bit5
R
-
Bit4
R
-
Rev. 1.2
Bit3
R
-
R/W
Bit2
-
PGSEL1
R/W
Bit1
C8051F018
C8051F019
PGSEL0
R/W
Bit0
SFR Address:
Reset Value
00000000
0xAF
74