Z86U18 Datasheet, PDF(19/30 Page) Zilog, Inc. – USB Device Controller with CMOS Z86K15 MCU

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Z86U18 Datasheet, PDF (19/30 Pages) Zilog, Inc. – USB Device Controller with CMOS Z86K15 MCU

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Zilog

Z8 CONTROL REGISTER DIAGRAMS

R241 TMR

D7 D6 D5 D4 D3 D2 D1 D0

0 = No Function

1 = Load T0

0 = Disable T0 Count

1 = Enable T0 Count

Reserved (Must be 0)

Figure 19. Timer Mode Register

(F1H: Read/Write)

R244 T0

D7 D6 D5 D4 D3 D2 D1 D0

T0 Initial Value

(When Written)

(Range 1-256 Decimal

01-00 HEX)

T0 Current Value

(When READ)

Figure 20. Counter/Timer 0 Register

(F4H: Read/Write)

R245 PRE0

D7 D6 D5 D4 D3 D2 D1 D0

Count Mode

0 = T0 Single Pass

1 = T0 Modulo N

Reserved (Must be 0)

Prescaler Modulo

(Range: 1-64 Decimal

01-00 HEX)

Figure 21. Prescaler 0 Register

(F5H: Write Only)

R246 P2M

D7 D6 D5 D4 D3 D2 D1 D0

Reserved

P24-P27 I/O Definition

0 Defines Bit as OUTPUT

1 Defines Bit as INPUT

Figure 22. Port 2 Mode Register

(F6H: Write Only)

Z86U18

USB Device Controller with CMOS Z86K15 MCU

R247 P3M

D7 D6 D5 D4 D3 D2 D1 D0

0 Port 2 Open-Drain

1 Port 2 Push-Pull

Reserved (Must be 0)

Figure 23. Port 2 Open Drain Register

(F7H: Write Only)

R249 IPR

D7 D6 D5 D4 D3 D2 D1 D0

Interrupt Group Priority

Reserved = 000

C > A > B = 001

A > B > C = 010

A > C > B = 011

B > C > A = 100

C > B > A = 101

B > A > C = 110

Reserved = 111

IRQ1, IRQ4 Priority (Group C)

0 = IRQ1 > IRQ4

1 = IRQ4 > IRQ1

IRQ0, IRQ2 Priority (Group B)

0 = IRQ2 > IRQ0

1 = IRQ0 > IRQ2

Reserved (Must be 0)

Figure 24. Interrupt Priority Register

(F9H: Write Only)

R250 IRQ

D7 D6 D5 D4 D3 D2 D1 D0

* On RESET

IRQ0 = P32 Input

IRQ1 = P33 Input

IRQ2 = P31 Input

IRQ3 = USB

IRQ4 = T0

WDT During HALT

0 OFF *

1 ON

Stop Flag

0 POR/WDT*

1 Stop Recovery

WDT Hot Bit (Read Only)

0 POR*

1 WDT Timeout

Figure 25. Interrupt Request Register

(FAH: Read/Write)

DS97KEY0102

PRELIMINARY

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