EZ80F91MCU Datasheet, PDF (310/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
291
ZDI Write Operations
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 Data Byte
ZCL
7
8
9
1
2
3
4
5
6
7
8
9
ZDA
A0 Write 0/1 D7 D6
msb
of DATA
D5 D4
D3 D2
D1
D0 1
lsb
of DATA
lsb of
Single-Bit
ZDI Address Byte Separator
Figure 56. ZDI Single-Byte Data Write Timing
End of Data
or New ZDI
START Signal
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 (30h), the address stops incrementing.
Figure 57 illustrates the timing for ZDI block Write operations.
PS019209-0504
PRELIMINARY
ZiLOG Debug Interface