參數(shù)資料
型號(hào): MTA85811S-04I/SS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封裝: 0.209 INCH, PLASTIC, SSOP-20
文件頁數(shù): 51/72頁
文件大?。?/td> 760K
代理商: MTA85811S-04I/SS
1995 Microchip Technology Inc.
DS40115C-page 55
MTA85XXX
18.3
Acknowledge Polling
Since the device will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (this feature can be used to maximize bus
throughput). Once the STOP condition for
a write
command has been issued from the master, the device
initiates the internally timed write cycle. ACK polling
can be initiated immediately. This involves the master
sending a START condition followed by the control byte
for a write command (R/W = 0). If the device is still busy
with the write cycle, then no ACK will be returned. If the
cycle is complete, then the device will return the ACK
and the master can then proceed with the next read or
write command. See Figure 18-3 for flow diagram.
FIGURE 18-3: ACKNOWLEDGE POLLING
FLOW
Did Device
Acknowledge
(ACK = 0)?
Send
Write Command
Send Stop
Condition to
Initiate Write Cycle
Send Start
Send Control Byte
with R/W = 0
Next
Operation
No
Yes
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