Z86C21 datasheet(26/35 Pages) ZILOG

26 / 35 page

\26

Z86C21 MCU

WITH

8K ROM

Z8 CONTROL REGISTER DIAGRAMS (Continued)

Enables RAM Protect

Enables IRQ5-IRQ0

(D0 = IRQ0)

Enables Interrupts

R251 IMR

R252 FLAGS

User Flag F1

User Flag F2

Half Carry Flag

Decimal Adjust Flag

Overflow Flag

Sign Flag

Zero Flag

Carry Flag

Stack Pointer Upper

Byte (SP15 - SP8)

R254 SPH

D7 D6 D5 D4 D3 D2 D1 D0

Stack Pointer Lower

Byte (SP7 - SP0)

R255 SPL

R253 RP

0 Reserved (Must be 0)

Figure 33. Interrupt Request Register

(FA

H: Read/Write)

Figure 36. Register Pointer Register

(FD

H: Read/Write)

Figure 35. Flag Register

(FC

H: Read/Write)

Figure 38. Stack Pointer Register

(FF

H: Read/Write)

R250 IRQ

Reserved (Must be 0)

IRQ0 = P32 Input (D0 = IRQ0)

IRQ1 = P33 Input

IRQ2 = P31 Input

IRQ3 = P30 Input, Serial Input

IRQ4 = T0

Serial Output

IRQ5 = T1

Figure 37. Stack Pointer Register

(FE

H: Read/Write)

Figure 34. Interrupt Mask Register

(FB

H: Read/Write)

Z86C21 Datasheet(PDF) 26 Page - Zilog, Inc.

Z86C21 Datasheet(HTML) 26 Page - Zilog, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

Datasheet Download

Link URL