Figure 9-41. Uart, Sharp-Ir, Sir, And Consumer Remote Control Timing Diagram; Table 9-29. Uart, Sharp-Ir, Sir, And Consumer Remote Control Timing Parameters - AMD Geode SC3200 Data Book

32581C
9.3.10 Serial Port (UART)

Table 9-29. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Parameters

Symbol Parameter
t Single bit time in UART and
BT
Sharp-IR
t Modulation signal pulse width in
CMW
Sharp-IR and Consumer
Remote Control
t Modulation signal period in
CMP
Sharp-IR and Consumer
Remote Control
t SIR signal pulse width
SPW
S SIR data rate tolerance % of
DRT
nominal data rate
t SIR leading edge jitter % of
SJT
nominal bit duration
Note 1. t is the nominal bit time in UART, Sharp-IR, SIR and Consumer Remote Control modes. It is determined by the
BTN
setting of the Baud Generator Divisor registers.
Note 2. t is the nominal pulse width of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is
CWN
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 is the nominal period of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is deter-
CPN
mined by the MCFR field (bits [4:0]) of the IRTXMC registerand the TXHSC bit (bit 2) of the RCCFG register.
Note 4. t and t define the time range within which the period of the incoming subcarrier signal has to fall in order
MMIN MMAX
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.
UART
t
Sharp IR
CMW
Consumer
Remote
Control
t
SPW
SIR

Figure 9-41. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Diagram

404
Min
t - 25
BTN
(Note 1)
t - 2%
BTN
t - 25
CWN
(Note 2)
500
t - 25
CPN
(Note 3)
t
MMIN
(Note 4)
3
( / ) x t
16 BTN
(Note 1)
1.48
1
t
BT
t
CMP
Max
t + 25
BTN
t + 2%
BTN
t + 25
CWN
t + 25
CPN
t
MMAX
(Note 4)
3 + 15
- 15 ( / ) x t
16 BTN
(Note 1)
1.78
± 0.87%
± 2.0%
± 2.5%
± 6.5%
AMD Geode™ SC3200 Processor Data Book
Electrical Specifications
Unit Comments
ns Transmitter
ns Receiver
ns Transmitter
ns Receiver
ns Transmitter
ns Receiver
ns Transmitter, Variable
µs Transmitter, Fixed
µs Receiver
Transmitter
Receiver
Transmitter
Receiver