Z8F0113HJ005EG Datasheet, PDF (224/245 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F0823 Series
Product Specification
209
Figure 33 and Table 134 provide timing information for UART pins for the case where
CTS is not used for flow control. DE asserts after the transmit data register has been writ-
ten. 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.
T2
DE
(Output)
TXD
(Output)
start bit0
bit 1
T1
bit 7 parity
Figure 33. UART Timing Without CTS
stop
end of
stop bit(s)
Table 134. UART Timing Without CTS
Delay (ns)
Parameter Abbreviation
Minimum
Maximum
UART
T₁
T₂
DE assertion to TXD falling edge (start bit) delay 1 * X_IN period
End of Stop Bit(s) to DE deassertion delay (Tx data
±5
register is empty)
1 bit time
PS024315-1011
P R E L I M I N A R Y On-Chip Peripheral AC and DC Electrical