EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 310

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

Figure 56. ZDI Single-Byte Data Write Timing
PS019209-0504
ZDA
ZCL
ZDI Write Operations
ZDI Address
lsb of
A0
ZDI Single-Byte Write
For single-byte Write operations, the address and write control bit are first written
to the ZDI block. Following the single-bit byte separator, the data is shifted into the
ZDI block on the next 8 rising edges of ZCL. The master terminates activity after 8
clock cycles.Figure 56 illustrates the timing for ZDI single-byte Write operations.
ZDI Block Write
The block Write operation is initiated in the same manner as the single-byte Write
operation, but instead of terminating the Write operation after the first data byte is
transferred, the ZDI master can continue to transmit additional bytes of data to the
ZDI slave on the eZ80F91 device. After the receipt of each byte of data the ZDI
register address increments by 1. If the ZDI register address reaches the end of
the Write Only ZDI register address space (
Figure 57 illustrates the timing for ZDI block Write operations.
7
Write
8
Byte Separator
Single-Bit
0/1
9
of DATA
msb
D7
1
D6
P R E L I M I N A R Y
2
D5
3
ZDI Data Byte
D4
4
30h
D3
5
), the address stops incrementing.
D2
6
D1
7
Product Specification
of DATA
ZiLOG Debug Interface
D0
lsb
8
START Signal
End of Data
or New ZDI
eZ80F91 MCU
1
9
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