ZLP128ICE01ZEM Zilog, ZLP128ICE01ZEM Datasheet - Page 42

• Manufacturer Part Number: ZLP128ICE01ZEM
• Description: EMULATOR CRIMZON Z8 ZLP12840
• Manufacturer: Zilog

Specifications of ZLP128ICE01ZEM

• Interface Type: RS-232, Ethernet, USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3829

Table 18. User Data Register (USER)
PS024410-0108
Bit
Field
Reset
R/W
Address
Bit
Position Value
[7:0]
User Data Register
Stack Pointer Register
Note:
00h–FFh User Data
R/W
Bank-independent register FEh is available for user data storage
Do not use register FEh as a counter for the DJNZ instruction.
The Stack Pointer Register contains the 8-bit address of the stack pointer. The stack
pointer resides in Bank 0 of RAM. The stack address is decremented prior to a PUSH
operation and incremented after a POP operation. The stack address always points to the
data stored at the ‘top’ of the stack (the lowest stack address). During a call instruction, the
contents of the Program Counter are saved on the stack. Interrupts cause the contents of
the Program Counter and Flags registers to be saved on the stack. An overflow or
underflow can occur when the stack address is incremented or decremented during normal
operations. You must prevent this occurrence otherwise, it results in unpredictable
operations
X
7
Description
(Table
R/W
X
6
19).
R/W
Bank Independent: FEh; Linear: 0FEh
P R E L I M I N A R Y
X
5
R/W
X
4
User Data
R/W
X
3
R/W
X
2
Product Specification
(Table
ZLP12840 OTP MCU
Memory and Registers
R/W
18).
X
1
R/W
X
0
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