EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 306

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

PS019209-0504
ZDI-Supported Protocol
downloads and uploads data, with a maximum frequency of one-half the eZ80F91
system clock frequency, or less. See Table 185 for recommended values.
Table 185. Recommend ZDI Clock vs. System Clock Frequency
ZDI supports a bidirectional serial protocol. The protocol defines any device that
sends data as the transmitter and any receiving device as the receiver. The
device controlling the transfer is the master and the device being controlled is the
slave. The master always initiates the data transfers and provides the clock for
both receive and transmit operations. The ZDI block on the eZ80F91 device is
considered a slave in all data transfers.
Figure 52 illustrates the schematic for building a connector on a target board. This
connector allows the user to connect directly to the ZPAK emulator using a six-pin
header.
Figure 52. Schematic For Building a Target Board ZPAK Connector
System Clock Frequency
eZ80F91
12–24 MHz
20–50 MHz
3–10 MHz
8–16 MHz
TCK (ZCL)
TDI (ZDA)
330 KΩ
P R E L I M I N A R Y
6-Pin Target Connector
ZDI Clock Frequency
330 KΩ
1 MHz
2 MHz
4 MHz
8 MHz
2
4
6
Product Specification
ZiLOG Debug Interface
1
3
5
(Target V
eZ80F91 MCU
TV
DD
DD
)
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