Z86D990 Datasheet, PDF(19/102 Page) Zilog, Inc. – Low-Voltage Micro controllers with ADC

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

Z86D990 Datasheet, PDF (19/102 Pages) Zilog, Inc. – Low-Voltage Micro controllers with ADC

◁

Z86D990/Z86D991 OTP and Z86L99X ROM

Low-Voltage Microcontrollers with ADC

Location (Hex)

FFFF

FF00

3FFF/7FFF

(ROM)/(OTP)

256 bytes

Executable RAM

Not Implemented

PROGRAM

MEMORY

000C

000B

000A

0009

0008

0007

0006

0005

0004

0003

0002

0001

0000

Figure 5.

Location of the first byte of the initial instruction executed after

RESET

IRQ5 (lower byte)

IRQ5 (upper byte)

IRQ4 (lower byte)

IRQ4 (upper byte)

IRQ3 (lower byte)

IRQ3 (upper byte)

IRQ2 (lower byte)

IRQ2 (upper byte)

IRQ1 (lower byte)

IRQ1 (upper byte)

IRQ0 (lower byte)

IRQ0 (upper byte)

Program Memory Map

Z8 Standard Register File (Bank 0)

Bank 0 of the Z8 expanded register file architecture is known as the standard reg-

ister file of the Z8. As shown in Figure 6, the Z8 standard register file consists of

16 groups of sixteen 8-bit registers known as Working Register (WR) groups.

Working Register Group F contains various control and status registers. The lower

half of Working Register Group 0 consists of I/O port registers (R0 to R7), the

upper eight registers are available for use as general-purpose RAM registers.

Working Register Group 1 through Group E of the standard register file are avail-

able to be used as general-purpose RAM registers. The user can use 233 bytes of

general-purpose RAM registers in the standard Z8 register file (Bank 0).

PS003807-1002

PRELIMINARY

▷