z8f1621 ZiLOG Semiconductor, z8f1621 Datasheet - Page 249
z8f1621
Manufacturer Part Number
z8f1621
Description
High Performance 8-bit Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8F1621.pdf
(297 pages)
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PS019921-0308
(Output)
(Output)
DE
TXD
Figure 56
Clear To Send input signal (CTS) is not used for flow control. In this example, it is
assumed that the Driver Enable polarity has been configured to be Active Low and is
represented here by DE. DE asserts after the UART Transmit Data Register has been
written. DE remains asserted for multiple characters as long as the Transmit Data register
is written with the next character before the current character has completed.
Table 121. UART Timing without CTS
Parameter Abbreviation
T
T
1
2
and
DE Assertion to TXD Falling Edge (Start)
Delay
End of Stop Bit(s) to DE Deassertion Delay 1 * XIN period 2 * XIN period
Table 121
Figure 56. UART Timing without CTS
T
1
Start
provide timing information for UART pins for the case where the
Bit 0
Bit 1
Z8 Encore! XP
Bit 7
1 Bit period
Minimum
Product Specification
Parity
Delay (ns)
Electrical Characteristics
®
Stop
Stop Bit(s)
F64XX Series
1 Bit period +
1 * XIN period
End of
Maximum
T
2
235
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