ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 175

• Manufacturer Part Number: ez80190
• Description: Ez80190 Microprocessor
• Manufacturer: ZiLOG Semiconductor

PS006613-0306
Bit
Reset
CPU Access
Note: X = Undefined; W = Write.
Bit
Position
[7:0]
ZDI_IS4,
ZDI_IS3,
ZDI_IS2,
ZDI_IS1,
or ZDI_IS0
(ZDI_IS4 = 21h, ZDI_IS3 = 22h, ZDI_IS2 = 23h, ZDI_IS1 = 24h, ZDI_IS0 = 25h)
ZDI Write Memory Register
A write to the ZDI Write Memory register, indicated in
eZ80190 device to write the 8-bit data to the memory location specified by the cur-
rent address in the program counter. In Z80 MEMORY mode, this address is
{MBASE, PC[15:0]}. In ADL MEMORY mode, this address is PC[23:0]. The pro-
gram counter, PC, increments after each data write. However, the ZDI register
address does not increment automatically when this register is accessed. As a
result, the ZDI master is allowed to write any number of data bytes by writing to
this address one time, and then writing any number of data bytes.
auto-address increment function to load up and execute an instruction with
a single data stream from the ZDI master.
Value Description
00h–
FFh
Table 87. Instruction Store 4:0 Registers
W
X
7
These registers contain the Op Codes and operands for
immediate execution by the CPU following a write to
ZDI_IS0. The ZDI_IS0 register contains the first Op Code
of the instruction. The remaining ZDI_ISx registers
contain any additional Op Codes or operand dates
required for execution of the required instruction.
W
X
6
PRELIMINARY
W
X
5
W
X
4
W
X
3
eZ80190 Product Specification
Table
W
X
2
88, causes the
W
X
1
ZiLOG Debug Interface
W
X
0
161