CY8C52 datasheet(42/94 Pages) CYPRESS

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PSoC® 5: CY8C52 Family Datasheet

Document Number: 001-66236 Rev. **

Page 42 of 94

7.7 Timers, Counters, and PWMs

The Timer/Counter/PWM peripheral is a 16-bit dedicated

peripheral providing three of the most common embedded

peripheral features. As almost all embedded systems use some

combination of timers, counters, and PWMs. Four of them have

been included on this PSoC device family. Additional and more

advanced functionality timers, counters, and PWMs can also be

instantiated in Universal Digital Blocks (UDBs) as required.

PSoC Creator allows designers to choose the timer, counter, and

PWM features that they require. The tool set utilizes the most

optimal resources available.

The Timer/Counter/PWM peripheral can select from multiple

clock sources, with input and output signals connected through

the DSI routing. DSI routing allows input and output connections

to any device pin and any internal digital signal accessible

through the DSI. Each of the four instances has a compare

output, terminal count output (optional complementary compare

output), and programmable interrupt request line. The

Timer/Counter/PWMs are configurable as free running, one shot,

or Enable input controlled. The peripheral has timer reset and

capture inputs, and a kill input for control of the comparator

outputs. The peripheral supports full 16-bit capture.

Timer/Counter/PWM features include:

16-bit timer/counter/PWM (down count only)

Selectable clock source

PWM comparator (configurable for LT, LTE, EQ, GTE, GT)

Period reload on start, reset, and terminal count

Interrupt on terminal count, compare true, or capture

Dynamic counter reads

Timer capture mode

Count while enable signal is asserted mode

Free run mode

One Shot mode (stop at end of period)

Complementary PWM outputs with deadband

PWM output kill

Figure 7-21. Timer/Counter/PWM

7.8 I2C

The I2C peripheral provides a synchronous two wire interface

designed to interface the PSoC device with a two wire I2C serial

communication bus. The bus is compliant with Philips ‘The I2C

Specification’ version 2.1. Additional I2C interfaces can be

instantiated using Universal Digital Blocks (UDBs) in PSoC

Creator, as required.

To eliminate the need for excessive CPU intervention and

overhead, I2C specific support is provided for status detection

and generation of framing bits. I2C operates as a slave, a master,

or multimaster (Slave and Master). In slave mode, the unit

always listens for a start condition to begin sending or receiving

data. Master mode supplies the ability to generate the Start and

Stop conditions and initiate transactions. Multimaster mode

provides clock synchronization and arbitration to allow multiple

masters on the same bus. If Master mode is enabled and Slave

mode is not enabled, the block does not generate interrupts on

externally generated Start conditions. I2C interfaces through the

DSI routing and allows direct connections to any GPIO or SIO

pins.

I2C features include:

Slave and master, transmitter, and receiver operation

Byte processing for low CPU overhead

Interrupt or polling CPU interface

Support for bus speeds up to 1 Mbps (3.4 Mbps in UDBs)

7 or 10-bit addressing (10-bit addressing requires firmware

support)

SMBus operation (through firmware support - SMBus

supported in hardware in UDBs)

Data transfers follow the format shown in Figure 7-22. After the

START condition (S), a slave address is sent. This address is 7

bits long followed by an eighth bit which is a data direction bit

(R/W) - a 'zero' indicates a transmission (WRITE), a 'one'

indicates a request for data (READ). A data transfer is always

terminated by a STOP condition (P) generated by the master.

However, if a master still wishes to communicate on the bus, it

can generate a repeated START condition (Sr) and address

another slave without first generating a STOP condition. Various

combinations of read/write formats are then possible within such

a transfer.

Timer / Counter /

PWM 16-bit

Clock

Reset

Enable

Capture

Kill

IRQ

Compare

TC / Compare!

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