ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 258

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 138. ZDI Write Data Registers (ZDI_WR_U = 13h, ZDI_WR_H = 14h, and ZDI_WR_L =
15h in the ZDI Register Write Only Address Space)
PS027001-0707
Bit
Reset
CPU Access
Note: X = Undefined; W = Write.
Bit
Position
[7:0]
zdi_wr_l,
zdi_wr_h,
or
zdi_wr_l
ZDI Write Data Registers
These three registers are used in the ZDI Write Only register address space to store the
data that is written when a Write instruction is sent to the ZDI Read/Write Control register
(ZDI_RW_CTL). The ZDI Read/Write Control register is located at ZDI address
immediately following the ZDI Write Data registers. As a result, the ZDI Master is
allowed to write the data to {ZDI_WR_U, ZDI_WR_H, ZDI_WR_L} and the Write
command in one data transfer operation. See
Value
00h–FFh
W
X
7
Description
These registers contain the data that is written during
execution of a Write operation defined by the
ZDI_RW_CTL register. The 24-bit data value is stored
as {ZDI_WR_U, ZDI_WR_H, ZDI_WR_L}. If less than
24 bits of data are required to complete the required
operation, the data is taken from the least-significant
byte(s).
W
X
6
W
X
5
W
X
4
W
X
3
Table
138.
W
X
2
W
X
1
Product Specification
W
X
0
Zilog Debug Interface
eZ80F91 ASSP
16h
250