參數(shù)資料
型號(hào): M68EVB908GB60E
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 86/290頁(yè)
文件大小: 0K
描述: BOARD EVAL FOR MC9S08GB60
標(biāo)準(zhǔn)包裝: 1
類型: MCU
適用于相關(guān)產(chǎn)品: MC9S08GB60
所含物品: 模塊和其他硬件
產(chǎn)品目錄頁(yè)面: 730 (CN2011-ZH PDF)
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Serial Communications Interface (SCI) Module
MC9S08GB/GT Data Sheet, Rev. 2.3
176
Freescale Semiconductor
When polling is used, this sequence is naturally satised in the normal course of the user program. If
hardware interrupts are used, SCIxS1 must be read in the interrupt service routine (ISR). Normally, this is
done in the ISR anyway to check for receive errors, so the sequence is automatically satised.
The IDLE status ag includes logic that prevents it from getting set repeatedly when the RxD1 line remains
idle for an extended period of time. IDLE is cleared by reading SCIxS1 while IDLE = 1 and then reading
SCIxD. After IDLE has been cleared, it cannot become set again until the receiver has received at least one
new character and has set RDRF.
If the associated error was detected in the received character that caused RDRF to be set, the error ags —
noise ag (NF), framing error (FE), and parity error ag (PF) — get set at the same time as RDRF. These
ags are not set in overrun cases.
If RDRF was already set when a new character is ready to be transferred from the receive shifter to the
receive data buffer, the overrun (OR) ag gets set instead and the data and any associated NF, FE, or PF
condition is lost.
11.8
Additional SCI Functions
The following sections describe additional SCI functions.
11.8.1
8- and 9-Bit Data Modes
The SCI system (transmitter and receiver) can be congured to operate in 9-bit data mode by setting the
M control bit in SCIxC1. In 9-bit mode, there is a ninth data bit to the left of the MSB of the SCI data
register. For the transmit data buffer, this bit is stored in T8 in SCIxC3. For the receiver, the ninth bit is
held in R8 in SCIxC3.
When transmitting 9-bit data, write to the T8 bit before writing to SCIxD for coherent writes to the transmit
data buffer. If the bit value to be transmitted as the ninth bit of a new character is the same as for the
previous character, it is not necessary to write to T8 again. When data is transferred from the transmit data
buffer to the transmit shifter, the value in T8 is copied at the same time data is transferred from SCIxD to
the shifter.
When receiving 9-bit data, clear the RDRF bit by reading both R8 and SCIxD. R8 and SCIxD can be read
in either order.
9-bit data mode typically is used in conjunction with parity to allow eight bits of data plus the parity in the
ninth bit. Or it is used with address-mark wakeup so the ninth data bit can serve as the wakeup bit. In
custom protocols, the ninth bit can also serve as a software-controlled marker.
11.9
Stop Mode Operation
During all stop modes, clocks to the SCI module are halted.
In stop1 and stop2 modes, all SCI register data is lost and must be re-initialized upon recovery from these
two stop modes.
No SCI module registers are affected in stop3 mode.
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