Z86C6116PSC View Datasheet(PDF) - Zilog

Part Name

Description

MFG CO.

Z86C6116PSC

CMOS Z8®MICROCONTROLLER

Zilog 

FUNCTIONAL DESCRIPTION (Continued)

Z86C61/62/96

Z8® MICROCONTROLLER

Register File. The Register File consists of four I/O port

registers, 236 general-purpose registers and 16 control

and status registers (Figure 18). There are eight further

registers for I/O ports 4, 5 and 6 in the Expanded Register

File (Bank F, R9-R2) (Figure 20).

The instructions can access registers directly or indirectly

through an 8-bit address field. The Z86C61/62/96 also

allows short 4-bit register addressing using the Register

Pointer (Figure 19). In the 4-bit mode, the Register File is

divided into 16 working register groups, each occupying

16 continuous locations. The Register Pointer addresses

the starting location of the active working-register group.

Note: Register Bank E0-EF can only be accessed through

working registers and indirect addressing modes.

R253 RP

D7 D6 D5 D4 D3 D2 D1 D0

Default Setting After Reset = 00000000

Expanded Register Group

Working Register Group

Figure 19. Register Pointer Register

Location

R255

R254

R253

R252

R251

R250

R249

R248

R247

R246

R245

R244

R243

R242

R241

R240

R239

R4

R3

R2

R1

R0

Stack Pointer (Bits 7-0)

Stack Pointer (Bits 15-8)

Register Pointer

Program Control Flags

Interrupt Mask Register

Interrupt Request Register

Interrupt Priority Register

Ports 0-1 Mode

Port 3 Mode

Port 2 Mode

T0 Prescaler

Timer/Counter0

T1 Prescaler

Timer/Counter1

Timer Mode

Serial I/O

Identifiers

SPL

SPH

RP

FLAGS

IMR

IRQ

IPR

P01M

P3M

P2M

PRE0

T0

PRE1

T1

TMR

SIO

General-Purpose

Registers

Port 3

P3

Port 2

P2

Port 1

P1

Port 0

P0

Figure 18. Register File

20

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