ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 174

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

PS006613-0306
Hex
Value
06
07
08
09
0A
0B
Note: 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 alternate
CPU register set.
Instruction Store 4:0 Registers
The ZDI Instruction Store registers, indicated in
Register Write Only address space. They can be written with instruction data for
direct execution by the CPU. When the ZDI_IS0 register is written, the eZ80190
device exits the ZDI BREAK mode and executes a single instruction. The Op
Codes and operands for the instruction are received from these Instruction Store
registers. Instruction Store Register 0 is the first byte fetched, followed by Instruc-
tion Store registers 1, 2, 3 and 4, as necessary. Only the bytes the processor
requires to execute the instruction must be stored in these registers. Some eZ80
CPU instructions, when combined with the MEMORY mode suffixes (.SIS, .SIL,
.LIS, or .LIL), require 6 bytes to operate. These 6-byte instructions cannot be exe-
cuted directly using the ZDI Instruction Store registers.
Note:
Command
Read SP
In ADL mode, SP = SPL.
In Z80 mode, SP = SPS.
Read PC
ZDI_RD_U
ZDI_RD_H
ZDI_RD_L
Set ADL
ADL ← 1
Reset ADL
ADL
Exchange CPU register sets
AF
BC
DE
HL
Read memory from current
PC value, increment PC
The Instruction Store 0 register resides at a higher ZDI address than the
other Instruction Store registers. This feature allows the use of the ZDI
Table 86. ZDI Read/Write Control Register Functions
←
←
←
←
←
AF’
HL’
BC’
DE’
0
←
←
←
(ZDI_RW_CTL = 16h) (Continued)
PC[7:0]
PC[23:16]
PC[15:8]
PRELIMINARY
Hex
Value
86
87
88
89
8A
8B
Command
Write SP
In ADL mode, SP = SPL.
In Z80 mode, SP = SPS.
Write PC
PC[23:16]
PC[15:8]
PC[7:0]
Reserved
Reserved
Reserved
Write memory from current PC
value, increment PC
Table
eZ80190 Product Specification
←
87, are located in the ZDI
←
←
ZDI_WR_L
ZDI_WR_H
ZDI_WR_U
ZiLOG Debug Interface
®
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