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Z86E40 Datasheet(PDF) 8 Page - Zilog, Inc.

Part # Z86E40
Description  General-Purpose Register File. Flexible I/O. Analog Inputs
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z86E40 Datasheet(HTML) 8 Page - Zilog, Inc.

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Z8 Family of Microcontrollers
User Manual
Table of Contents
UM001602-0904
viii
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
External Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Internal Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Interrupt Request Register Logic and Timing . . . . . . . . . . . . . . . . . . . . . 141
Interrupt Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Interrupt Priority Register Initialization . . . . . . . . . . . . . . . . . . . . . . 143
Interrupt Mask Register Initialization . . . . . . . . . . . . . . . . . . . . . . . . 145
Interrupt Request Register Initialization . . . . . . . . . . . . . . . . . . . . . . 147
IRQ Software Interrupt Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Vectored Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Vectored Interrupt Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Nesting of Vectored Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Polled Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Reset Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Power-Down Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Halt Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Stop Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Stop-Mode Recovery Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Serial Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
UART Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
UART Bit-Rate Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
UART Receiver Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Receiver Shift Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Overwrites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Framing Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Transmitter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Overwrites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
UART Reset Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175


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