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R8C/14 Group, R8C/15 Group 14. Serial Interface
Rev.2.10 Jan 19, 2006 Page 137 of 253
REJ09B0164-0210
Figure 14.9 Transmit Timing in UART Mode
Transfer Clock
D0
TE Bit in U0C1
Register
TXD0
Set to “0” when interrupt request is acknowledged, or set by a program
• Transmit Timing When Transfer Data is 8-Bit Long (parity enabled, 1 stop bit)
Write data to U0TB register
TC
D1 D2 D3 D4 D5 D6 D7 P
SP
TC=16 (n + 1) / fj or 16 (n + 1) / fEXT
fj: Frequency of U0BRG count source (f1, f8, f32)
fEXT: Frequency of U0BRG count source (external clock)
n: Setting value to U0BRG register
The above timing diagram applies to the following conditions:
• PRYE bit in U0MR register = 1 (parity enabled)
• STPS bit in U0MR register = 0 (1 stop bit)
• U0IRS bit in UCON register = 1 (an interrupt request is generated when transmit completes)
ST D0 D1 D2 D3 D4 D5 D6 D7 P SPST D0 D1ST
Start bit Parity
bit
Stop pulsing
because the TE bit is set to “0”
D0TXD0
Write data to U0TB register
Transfer from U0TB register to UART0 transmit register
TC
D1 D2 D3 D4 D5 D6 D7 D8
SP SP
ST D0 D1 D2 D3 D4 D5 D6 D7 D8 SP SPST D0 D1ST
TI Bit in U0C1
Register
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
TXEPT Bit in
U0C0 Register
IR Bit S0TIC
Register
Stop
bit
• Transmit Timing When Transfer Data is 9-Bit Long (parity disabled, 2 stop bits)
“1”
“0”
Stop
bit
Stop
bit
Start bit
Transfer Clock
TE Bit in U0C1
Register
TI Bit in U0C1
Register
TXEPT Bit in
U0C0 Register
IR Bit in S0RIC
Register
“1”
“0”
“1”
“0”
“1”
“0”
Transfer from U0TB register to UART0 transmit register
TC=16 (n + 1) / fj or 16 (n + 1) / fEXT
fj: Frequency of U0BRG count source (f1, f8, f32)
fEXT: Frequency of U0BRG count source (external clock)
n: Setting value to U0BRG register
Set to “0” when interrupt request is acknowledged, or set by a program
The above timing diagram applies to the following conditions:
• PRYE bit in U0MR register = 0 (parity disabled)
• STPS bit in U0MR register = 1 (2 stop bits)
• U0IRS bit in UCON register = 0 (an interrupt request is generated when transmit buffer is empty)
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