Z86L79 Datasheet, PDF (56/58 Pages) Zilog, Inc. – Low-Voltage Microcontroller

Z86L79/80
Low-Voltage Microcontroller
Z8^® STANDARD CONTROL REGISTER DIAGRAMS (Continued)
Zilog
R251 IMR
D7 D6 D5 D4 D3 D2 D1 D0
* Default Setting After Reset
1 Enables IRQ4-IRQ0
(D0 = IRQ0)
Reserved (Must be 0)
Reserved (Must be 0)
0 Master Interrupt Disable*
1 Master Interrupt Enable
Figure 51. Interrupt Mask Register
((0) FBH: Read/Write)
R252 Flags
D7 D6 D5 D4 D3 D2 D1 D0
User Flag F1
User Flag F2
Half Carry Flag
Decimal Adjust Flag
Overflow Flag
Sign Flag
Zero Flag
Carry Flag
Figure 52. Flag Register
((0) FCH: Read/Write)
R253 RP
D7 D6 D5 D4 D3 D2 D1 D0
Default Setting After Reset = 0000 0000
Expanded Register
File Pointer
Working Register
Pointer
R246 P2M
D7 D6 D5 D4 D3 D2 D1 D0
*Default Setting After Reset
P27-P20 I/O Definition
0 Defines Bit as OUTPUT
1 Defines Bit as INPUT*
Figure 54. Port 2 Mode Register
(F6H: Write Only)
R254 RP
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer Upper
Byte (SP15-SP8)
Figure 55. Stack Pointer High
((0) FEH: Read/Write)
R255 SPL
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer Lower
Byte (SP ₀ - SP ₇₎
Figure 56. Stack Pointer Low
((0) FFH: Read/Write)
Figure 53. Register Pointer
((0) FDH: Read/Write)
3-56
PRELIMINARY
DS97LVO0601