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11 serial port (uart), Figure 9-42, Table 9-32 – AMD Geode SC1201 User Manual

Page 421

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AMD Geode™ SC1200/SC1201 Processor Data Book

421

Electrical Specifications

32579B

9.3.11

Serial Port (UART)

Figure 9-42. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Diagram

Table 9-32. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Parameters

Symbol

Parameter

Min

Max

Unit

Comments

t

BT

Single bit time in UART and
Sharp-IR

t

BTN

- 25

(Note 1)

t

BTN

+ 25

ns

Transmitter

t

BTN

- 2%

t

BTN

+ 2%

ns

Receiver

t

CMW

Modulation signal pulse width in
Sharp-IR and Consumer
Remote Control

t

CWN

- 25

(Note 2)

t

CWN

+ 25

ns

Transmitter

500

ns

Receiver

t

CMP

Modulation signal period in
Sharp-IR and Consumer
Remote Control

t

CPN

- 25

(Note 3)

t

CPN

+ 25

ns

Transmitter

t

MMIN

(Note 4)

t

MMAX

(Note 4)

ns

Receiver

t

SPW

SIR signal pulse width

(

3

/

16

) x t

BTN

- 15

(Note 1)

(

3

/

16

) x t

BTN

+ 15

(Note 1)

ns

Transmitter, Variable

1.48

1.78

µs

Transmitter, Fixed

1

µs

Receiver

S

DRT

SIR data rate tolerance % of
nominal data rate

± 0.87%

Transmitter

± 2.0%

Receiver

t

SJT

SIR leading edge jitter % of
nominal bit duration

± 2.5%

Transmitter

± 6.5%

Receiver

Note 1. t

BTN

is the nominal bit time in UART, Sharp-IR, SIR and Consumer Remote Control modes. It is determined by the

setting of the Baud Generator Divisor registers.

Note 2. t

CWN

is the nominal pulse width of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is

determined by the MCPW field (bits [7:5]) of the IRTXMC register and the TXHSC bit (bit 2) of the RCCFG register.

Note 3. t

CPN

is the nominal period of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is deter-

mined by the MCFR field (bits [4:0]) of the IRTXMC registerand the TXHSC bit (bit 2) of the RCCFG register.

Note 4. t

MMIN

and t

MMAX

define the time range within which the period of the incoming subcarrier signal has to fall in order

for the signal to be accepted by the receiver. These time values are determined by the contents of register IRRXDC
and the setting of the RXHSC bit (bit 5) of the RCCFG register.

t

BT

t

SPW

t

CMP

UART

Sharp IR

Consumer

Remote

SIR

t

CMW

Control

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