C8051F023R Silicon Laboratories Inc, C8051F023R Datasheet - Page 192

IC 8051 MCU 64K FLASH 64TQFP

C8051F023R

Manufacturer Part Number
C8051F023R
Description
IC 8051 MCU 64K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F02xr
Datasheets

Specifications of C8051F023R

Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
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 8x8b, 8x10b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Other names
336-1035-2
C8051F020/1/2/3
18.4.2. Clock Rate Register
Figure 18.9. SMB0CR: SMBus0 Clock Rate Register
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bits7-0:
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:
SMB0CR
The resulting SCL signal high and low times are given by the following equations:
T
LOW
T
HIGH
Using the same value of SMB0CR from above, the Bus Free Timeout period is given in the following
equation:
T
BFT
192
R/W
R/W
R/W
Bit4
Bit3
Bit2
 
SYSCLK  1.125 
288
0.85
 SYSCLK
=
256 SMB0CR
 SYSCLK
258 SMB0CR
+
256 SMB0CR
+
1
---------------------------------------------------- -
10
SYSCLK
Rev. 1.4
R/W
R/W
Reset Value
00000000
Bit1
Bit0
SFR Address:
0xCF
625ns

Related parts for C8051F023R