EFM32G230F64 Energy Micro, EFM32G230F64 Datasheet - Page 289
EFM32G230F64
Manufacturer Part Number
EFM32G230F64
Description
MCU 32BIT 64KB FLASH 64-QFN
Manufacturer
Energy Micro
Series
Geckor
Datasheets
1.EFM32-G230F128-SK.pdf
(65 pages)
2.EFM32-G230F128-SK.pdf
(10 pages)
3.EFM32G200F16.pdf
(463 pages)
4.EFM32G200F16.pdf
(136 pages)
Specifications of EFM32G230F64
Core Processor
ARM® Cortex-M3™
Core Size
32-Bit
Speed
32MHz
Connectivity
EBI/EMI, I²C, IrDA, SmartCard, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number Of I /o
56
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.8 V
Data Converters
A/D 8x12b, D/A 2x12b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VFQFN, Exposed Pad
Processor Series
EFM32G230
Core
ARM Cortex-M3
Data Bus Width
32 bit
Data Ram Size
16 KB
Interface Type
I2C, UART
Maximum Clock Frequency
32 MHz
Number Of Programmable I/os
56
Number Of Timers
3
Operating Supply Voltage
1.8 V to 3.8 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
- EFM32-G230F128-SK PDF datasheet
- EFM32-G230F128-SK PDF datasheet #2
- EFM32G200F16 PDF datasheet #3
- EFM32G200F16 PDF datasheet #4
- Current page: 289 of 463
- Download datasheet (8Mb)
21.3.3.2.3 Buffered Mode
2010-09-06 - d0001_Rev1.00
Figure 21.3. LETIMER One-shot Repeat State Machine
The Buffered repeat mode allows buffered timer operation. When started, the timer runs
LETIMERn_REP0 number of times. If LETIMERn_REP1 has been written since the last time it was used
and it is nonzero, LETIMERn_REP1 is then loaded into LETIMERn_REP0, and counting continues the
new number of times. The timer keeps going as long as LETIMERn_REP1 is updated with a nonzero
value before LETIMERn_REP0 is finished counting down.
If the timer is started when both LETIMERn_CNT and LETIMERn_REP0 are zero but LETIMERn_REP1
is non-zero, LETIMERn_REP1 is loaded into LETIMERn_REP0, and the counter counts the loaded
number of times. The state machine for the one-shot repeat mode is shown in Figure 21.3 (p. 289) .
Used in conjunction with a buffered top value, enabled by setting BUFTOP in LETIMERn_CTRL, the
buffered mode allows buffered values of both the top and repeat values of the timer, and the timer can
for instance be set to run 4 times with period 7 (top value 6), 6 times with period 200, then 3 times with
period 50.
A state machine for the buffered repeat mode is shown in Figure 21.4 (p. 290) . REP1
state machine is an internal variable that keeps track of whether the value in LETIMERn_REP1 has been
loaded into LETIMERn_REP0 or not. The purpose of this is that a value written to LETIMERn_REP1
should only be counted once. REP1
CNT = CNT - 1
CNT = TOP*
NO
NO
NO
REP0 = = 0
CNT = = 0
START
YES
YES
YES
If (COMP0TOP)
Else
TOP*
USED
TOP* = COMP0
TOP* = 0xFFFF
is cleared whenever LETIMERn_REP1 is written.
NO
...the world's most energy friendly microcontrollers
289
RUNNING
CNT = = 0
REP0 < 2
YES
YES
YES
Wait for positive clock edge
NO
TOP* *
If (! COMP0TOP)
Else if (COMPBUF)
Else
NO
TOP* * = 0xFFFF
TOP* * = COMP1
TOP* * = COMP0
CNT = CNT - 1
CNT = TOP*
If (! START)
STOP = 1
REP0 = 0
REP0 = REP0 - 1
www.energymicro.com
USED
If (STOP)
Else if (START)
End if
START = 0
STOP = 0
shown in the
RUNNING = 0
RUNNING = 1
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