C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 227
C8051F321
Manufacturer Part Number
C8051F321
Description
IC 8051 MCU 16K FLASH 28MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F32xr
Datasheet
1.C8051F320R.pdf
(256 pages)
Specifications of C8051F321
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
21
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 13x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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19.2.3. USB Start-of-Frame Capture
When T2SOF = ‘1’, Timer 2 operates in USB Start-of-Frame (SOF) capture mode. When T2SPLIT = ‘0’, Timer 2
counts up and overflows from 0xFFFF to 0x0000. Each time a USB SOF is received, the contents of the Timer 2 reg-
isters (TMR2H:TMR2L) are latched into the Timer 2 Reload registers (TMR2RLH:TMR2RLL). A Timer 2 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 T2SPLIT = ‘1’, the Timer 2 registers (TMR2H and TMR2L) 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 2 reg-
isters are latched into the Timer 2 Reload registers (TMR2RLH and TMR2RLL). A Timer 2 interrupt is generated if
enabled.
External Clock / 8
SYSCLK / 12
External Clock / 8
H
T
F
2
T
F
2
L
SYSCLK / 12
TMR2CN
T
F
2
L
E
N
S
O
SYSCLK
T
2
F
Figure 19.13. Timer 2 SOF Capture Mode (T2SPLIT = ‘0’)
Figure 19.14. Timer 2 SOF Capture Mode (T2SPLIT = ‘1’)
T
S
P
T
2
L
I
H
R
T
F
2
T
2
T
F
2
L
TMR2CN
E
N
T
X
C
K
T
F
2
L
2
L
0
1
T
S
O
F
2
T
S
P
T
2
L
I
T
R
2
SYSCLK
C
T
2
X
L
K
0
1
M
H
T
3
M
T
3
L
Start-of-Frame
CKCON
T
M
H
2
0
1
1
0
M
T
0
1
2
L
M
H
T
3
(SOF)
USB
M
T
1
M
T
3
L
M
CKCON
T
0
M
T
H
2
S
C
A
1
M
T
2
L
C
S
A
0
M
T
1
M
T
0
TR2
TR2
S
C
A
1
S
C
A
0
Enable
Rev. 1.1
Capture
TCLK
TCLK
TCLK
Overflow
TMR2RLH
TMR2RLL
TL2
TMR2H
TMR2RLL TMR2RLH
TMR2L
TMR2L
Interrupt
Capture
Capture
To SMBus
TMR2H
To SMBus
To ADC,
SMBus
C8051F320/1
Start-of-Frame
(SOF)
Enable
USB
To ADC,
SMBus
Interrupt
227
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