ez80f92 ZiLOG Semiconductor, ez80f92 Datasheet - Page 183

• Manufacturer Part Number: ez80f92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS015313-0508
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 com-
mand in one data transfer operation. See
Table 98. 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)
ZDI Read/Write Control Register
The ZDI Read/Write Control register is used in the ZDI Write Only Register address to
read data from, write data to, and manipulate the CPU’s registers or memory locations.
When this register is written, the eZ80F92 device immediately performs the operation cor-
responding to the data value written as listed in
ation is executed via this register, the requested data values are placed in the ZDI Read
Data registers {ZDI_RD_U, ZDI_RD_H, ZDI_RD_L}. When a Write operation is exe-
cuted via this register, the Write data is taken from the ZDI Write Data registers
{ZDI_WR_U, ZDI_WR_H, ZDI_WR_L}. See
CPU User Manual (UM0077) for information regarding the CPU registers.
Bit
Reset
CPU Access
Note: X = Undefined; W = Write.
Bit
Position
[7:0]
ZDI_WR_L,
ZDI_WR_H,
or
ZDI_WR_L
Value Description
00h–
FFh
W
X
7
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 LSBs.
W
X
6
Table
W
X
5
98.
Table 99
Table 99
W
X
4
on page 177. Refer to the eZ80
on page 177. When a Read oper-
W
X
3
Product Specification
W
X
2
eZ80F92/eZ80F93
Zilog Debug Interface
W
X
1
16h
W
X
0
®
176