ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 259

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

Table 139. ZDI Read/Write Control Register Functions (ZDI_RW_CTL = 16h in the ZDI
Register Write Only Address Space)
PS027001-0707
Hex
Value
00
01
02
03
04
Note:
Command
Read {MBASE, A, F}
ZDI_RD_U
ZDI_RD_H
ZDI_RD_L
Read BC
ZDI_RD_U
ZDI_RD_H
ZDI_RD_L
Read DE
ZDI_RD_U
ZDI_RD_H
ZDI_RD_L
Read HL
ZDI_RD_U
ZDI_RD_H
ZDI_RD_L
Read IX
ZDI_RD_U
ZDI_RD_H
ZDI_RD_L
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 eZ80F91 device immediately performs the operation
corresponding to the data value written as described in
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 executed via
this register, the Write data is taken from the ZDI Write Data registers {ZDI_WR_U,
ZDI_WR_H, ZDI_WR_L}. See
eZ80
The CPU’s alternate register set (A’, F’, B’, C’, D’, E’, HL’) cannot be read directly. The
ZDI programmer must execute the exchange instruction (EXX) to gain access to the alter-
nate CPU register set.
®
CPU User Manual (UM0077) available on www.zilog.com.
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
A
C
E
L
IXL
MBASE
F
BCU
B
DEU
D
HLU
H
IXU
IXH
Hex
Value
80
81
82
83
84
Table
139. For information on the CPU registers, refer to
Command
Write AF
MBASE
F
A
Write BC
BCU
B
C
Write DE
DEU
D
E
Write HL
HLU
H
L
Write IX
IXU
IXH
IXL
←
←
←
←
←
←
←
←
←
←
←
ZDI_WR_L
ZDI_WR_H
←
ZDI_WR_L
ZDI_WR_H
ZDI_WR_L
←
ZDI_WR_L
←
ZDI_WR_H
ZDI_WR_H
ZDI_WR_L
ZDI_WR_U
ZDI_WR_H
ZDI_WR_U
←
ZDI_WR_U
ZDI_WR_U
ZDI_WR_U
Table
139. When a Read operation
Product Specification
Zilog Debug Interface
eZ80F91 ASSP
251