Z86E61 Zilog., Z86E61 Datasheet - Page 14

• Manufacturer Part Number: Z86E61
• Description: CMOS Z8 16K/32K EPROM MICROCONTROLLER
• Manufacturer: Zilog.

ADDRESS SPACE (Continued)
14
LOCATION
R255
R254
R253
R252
R251
R250
R249
R248
R247
R246
R245
R244
R243
R242
R241
R240
R239
R4
R3
R2
R1
R0
Figure 13. Register File
Interrupt Request Register
Interrupt Priority Register
Stack Pointer (Bits 15-8)
Stack Pointer (Bits 7-0)
Interrupt Mask Register
Program Control Flags
General-Purpose
Register Pointer
Timer/Counter0
Timer/Counter1
Ports 0-1 Mode
T0 Prescaler
T1 Prescaler
Port 3 Mode
Port 2 Mode
Timer Mode
Serial I/O
Registers
Port 3
Port 2
Port 1
Port 0
P R E L I M I N A R Y
IDENTIFIERS
SPL
SPH
RP
FLAGS
IMR
IRQ
IPR
P01M
P3M
P2M
PRE0
T0
PRE1
T1
TMR
SIO
P3
P2
P1
P0
FF
F0
1F
10
2F
20
0F
00
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The upper nibble of the register file address
provided by the register pointer specifies
the active working-register group.
Figure 14. Register Pointer
r7 r6 r5 r4
Register Group F
Specified Working
Register Group 1
Register Group 0
Register Group
I/O Ports
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r3 r2 r1 r0
WITH
Z86E61/E63 Z8
R253
(Register Pointer)
16K/32K EPROM
The lower nibble
of the register
file address
provided by the
instruction points
to the specified
register.
R15 to R0
R15 to R0
R15 to R4
R3 to R0
®
MCU