C8051F320 Silicon Laboratories Inc, C8051F320 Datasheet - Page 232
C8051F320
Manufacturer Part Number
C8051F320
Description
IC 8051 MCU 16K FLASH 32LQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F32xr
Datasheet
1.C8051F320R.pdf
(256 pages)
Specifications of C8051F320
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
25
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 17x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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C8051F320/1
19.3.3. USB Start-of-Frame Capture
When T3SOF = ‘1’, Timer 3 operates in USB Start-of-Frame (SOF) capture mode. When T3SPLIT = ‘0’, Timer 3
counts up and overflows from 0xFFFF to 0x0000. Each time a USB SOF is received, the contents of the Timer 3 reg-
isters (TMR3H:TMR3L) are latched into the Timer 3 Reload registers (TMR3RLH:TMR3RLL). A Timer 3 interrupt
is generated if enabled. This mode can be used to calibrate the system clock or external oscillator against the known
USB host SOF clock.
When T3SPLIT = ‘1’, the Timer 3 registers (TMR3H and TMR3L) act as two 8-bit counters. Each counter counts up
independently and overflows from 0xFF to 0x00. Each time a USB SOF is received, the contents of the Timer 3 reg-
isters are latched into the Timer 3 Reload registers (TMR3RLH and TMR3RLL). A Timer 3 interrupt is generated if
enabled.
232
Figure 19.22. Timer 3
External Clock / 8
‘0’)
SYSCLK / 12
(T3SPLIT
Capture
External Clock / 8
T
F
H
Mode
3
=
T
F
3
L
TMR3CN
T
F
3
L
E
N
SYSCLK / 12
SOF
O
T
3
S
F
SYSCLK
T
3
S
P
L
T
I
R
T
3
H
T
F
3
T
F
3
L
X
C
K
T
3
L
0
1
TMR3CN
E
N
T
F
3
L
T
S
O
F
3
T
S
P
T
3
L
I
T
R
3
SYSCLK
C
T
3
X
L
K
0
1
Figure 19.23. Timer 3 SOF Capture Mode (T3SPLIT = ‘1’)
Start-of-Frame
M
T
3
H
0
1
1
0
M
T
3
L
0
1
(SOF)
USB
CKCON
M
H
T
2
M
H
T
3
M
T
2
L
M
T
3
L
M
T
1
CKCON
M
H
T
2
M
T
0
M
T
2
L
TR3
S
C
A
1
TR3
M
T
1
S
C
A
0
M
T
0
Rev. 1.1
S
C
A
1
S
C
A
0
Enable
TCLK
TCLK
Capture
TCLK
TMR3RLH
TMR3RLL
TMR3H
TMR3L
TMR3RLL TMR3RLH
TMR3L
Interrupt
Capture
Capture
TMR3H
To ADC
Start-of-Frame
(SOF)
Enable
USB
To ADC
Interrupt