z86e54 ZiLOG Semiconductor, z86e54 Datasheet - Page 35
z86e54
Manufacturer Part Number
z86e54
Description
Z8 512 Byte Otp Mcu
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z86E54.pdf
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PS020102-1003
The Z8
address field, thereby allowing short 4-bit register addressing mode using the
Register Pointer.
In the 4-bit address mode, the register file is divided into eight working register
groups, each occupying 16 continuous locations. The Register Pointer (Figure 15)
addresses the starting location of the active working-register group.
®
255(FFh)
253(FDh)
252(FCh)
254(FEh)
251(FBh)
250(FBh)
249(FAh)
248(F8h)
247(F7h)
246(F6h)
245(F5h)
244(F4h)
243(F3h)
242(F2h)
241(F1h)
240(F0h)
instructions can access registers directly or indirectly through an 8-bit
64(40h)
63(30h)
4(04h)
3(03h)
2(02h)
1(01h)
0(00h)
Location
Figure 14.Register File
Interrupt Request Register
Interrupt Priority Register
Interrupt Mask Register
Stack Pointer (Bits 7-0)
Program Control Flag9
General-Purpose
Not Implemented
Register Pointer
Ports 0-1 Mode
TimerCounter1
T1 Prescaler
Port 3 Mode
Port 2 Mode
Timer Mode
Reserved
Registers
Reserved
Reserved
Reserved
Port 3
Port 2
Port 0
Identifiers
SPL
GPR
RP
Flags
IMR
IRQ
IRP
P01M
P3M
P2M
Reserved
Reserved
PRE1
T1
TMR
P3
P2
Reserved
P0
Z8
®
512 Byte OTP MCU
Z86E54
29
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