C8051F352 Silicon Laboratories Inc, C8051F352 Datasheet - Page 204

• Manufacturer Part Number: C8051F352
• Description: IC 8051 MCU 8K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F35xr

Specifications of C8051F352

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, Temp Sensor, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x16b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Processor Series: C8051F35x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: I2C, SPI, UART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16 bit
• On-chip Dac: 8 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: No

C8051F350/1/2/3
22.3.2. 8-bit Timers with Auto-Reload
When T3SPLIT is set, Timer 3 operates as two 8-bit timers (TMR3H and TMR3L). Both 8-bit timers oper-
ate in auto-reload mode as shown in Figure 22.12. TMR3RLL holds the reload value for TMR3L;
TMR3RLH holds the reload value for TMR3H. The TR3 bit in TMR3CN handles the run control for TMR3H.
TMR3L is always running when configured for 8-bit Mode.
Each 8-bit timer may be configured to use SYSCLK, SYSCLK divided by 12, or the external oscillator clock
source divided by 8. The Timer 3 Clock Select bits (T3MH and T3ML in CKCON) select either SYSCLK or
the clock defined by the Timer 3 External Clock Select bit (T3XCLK in TMR3CN), as follows:
The TF3H bit is set when TMR3H overflows from 0xFF to 0x00; the TF3L bit is set when TMR3L overflows
from 0xFF to 0x00. When Timer 3 interrupts are enabled (IE.5), an interrupt is generated each time
TMR3H overflows. If Timer 3 interrupts are enabled and TF3LEN (TMR3CN.5) is set, an interrupt is gener-
ated each time either TMR3L or TMR3H overflows. When TF3LEN is enabled, software must check the
TF3H and TF3L flags to determine the source of the Timer 3 interrupt. The TF3H and TF3L interrupt flags
are not cleared by hardware and must be manually cleared by software.
204
External Clock / 8
T3MH
0
0
1
SYSCLK / 12
T3XCLK
T3XCLK
X
0
1
0
1
Figure 22.19. Timer 3 8-Bit Mode Block Diagram
SYSCLK
External Clock / 8
TMR3H Clock
SYSCLK / 12
SYSCLK
Source
0
1
1
0
M
H
T
3
M
T
3
L
CKCON
M
H
T
2
T
M
2
L
M
T
1
M
T
0
TR3
S
C
A
1
C
S
A
0
Rev. 0.4
TCLK
TCLK
TMR3RLH
TMR3RLL
TMR3H
TMR3L
T3ML
Reload
Reload
0
0
1
T3XCLK
T3SPLIT
TF3LEN
T3XCLK
TF3H
TF3L
X
TR3
0
1
External Clock / 8
TMR3L Clock
SYSCLK / 12
SYSCLK
Source
Interrupt