C8051F045-GQR Silicon Laboratories Inc, C8051F045-GQR Datasheet - Page 248
C8051F045-GQR
Manufacturer Part Number
C8051F045-GQR
Description
IC 8051 MCU 64K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F04xr
Specifications of C8051F045-GQR
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
CAN, EBI/EMI, 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
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 13x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F045-GQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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C8051F040/1/2/3/4/5/6/7
19.4.2. Clock Rate Register
248
Bits7-0:
R/W
Bit7
SMB0CR.[7:0]: SMBus0 Clock Rate Preset
The SMB0CR Clock Rate register controls the frequency of the serial clock SCL in master
mode. The 8-bit word stored in the SMB0CR Register preloads a dedicated 8-bit timer. The
timer counts up, and when it rolls over to 0x00, the SCL logic state toggles.
The SMB0CR setting should be bounded by the following equation, where SMB0CR is the
unsigned 8-bit value in register SMB0CR, and SYSCLK is the system clock frequency in Hz:
The resulting SCL signal high and low times are given by the following equations:
Using the same value of SMB0CR from above, the Bus Free Timeout period is given in the
following equation:
R/W
Bit6
SFR Definition 19.2. SMB0CR: SMBus0 Clock Rate
SMB0CR
T
R/W
Bit5
T
HIGH
BFT
T
LOW
10
288 0.85
258 SMB0CR
=
R/W
Bit4
–
---------------------------------------------------- -
256 SMB0CR
–
256 SMB0CR
–
–
Rev. 1.5
SYSCLK
R/W
Bit3
SYSCLK
SYSCLK
SYSCLK
1.124 6
R/W
Bit2
+
1
+
E
625ns
R/W
Bit1
SFR Address:
SFR Page:
R/W
Bit0
0xCF
0
00000000
Reset Value
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