Z86C34 Datasheet, PDF(63/70 Page) Zilog, Inc. – CMOS Z8 MCUs WITH ASCI UART OFFER EFFICIENT, COST-EFFECTIVE DESIGN FLEXIBILITY

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Z86C34 Datasheet, PDF (63/70 Pages) Zilog, Inc. – CMOS Z8 MCUs WITH ASCI UART OFFER EFFICIENT, COST-EFFECTIVE DESIGN FLEXIBILITY

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ZiLOG

R250 IRQ

D7 D6 D5 D4 D3 D2 D1 D0

IRQ0 = P32 Input

IRQ1 = P33 Input

IRQ2 = P31 Input

IRQ3 = P30 Input

IRQ4 = T0

IRQ5 = T1

Inter Edge

P31 â P32 â = 00

P31 â P32 â = 01

P31 â P32 â = 10

P31 ââ P32 ââ = 11

Figure 50. Interrupt Request Register

(FAH: READ/WRITE)

R251 IMR

D7 D6 D5 D4 D3 D2 D1 D0

1 Enables IRQ0-IRQ5

(D0 = IRQ0)

1 Enables RAM Protect *

* This option must be selected when ROM code is

submitted for ROM Masking, otherwise this control bit

is disabled permanently.

1 Enables Interrupts

Figure 51. Interrupt Mask Register

(FBH: READ/WRITE)

R252 FLAGS

D7 D6 D5 D4 D3 D2 D1 D0

* Not affected by reset

User Flag F1 *

User Flag F2 *

Half Carry Flag

Decimal Adjust Flag

Overflow Flag

Sign Flag

Zero Flag

Carry Flag

Figure 52. Flag Register

(FCH: READ/WRITE)

Z86C34/C35/C36/C44/C45/C46

CMOS Z8Â® MCUs with ASCI UART

R253 RP

D7 D6 D5 D4 D3 D2 D1 D0

Expanded Register File

Working Register Pointer

Figure 53. Register Pointer

(FDH: READ/WRITE)

R254 SPH

D7 D6 D5 D4 D3 D2 D1 D0

Stack Pointer Upper

Byte (SP8 - SP15)

Figure 54. Stack Pointer High

(FEH: READ/WRITE)

R255 SPL

D7 D6 D5 D4 D3 D2 D1 D0

Stack Pointer Lower

Byte (SP0 - SP7)

Figure 55. Stack Pointer Low

(FFH: READ/WRITE)

DS007601-Z8X0499

PRELIMINARY

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