Z86K14 datasheet(19/24 Pages) ZILOG

19 / 24 page

Z86K13/K14/K15/K16/K17/K18

Zilog

CMOS Z8® 8-Bit MCU Keyboard Controllers

DS97KEY0204

P R E L I M I N A R Y

® CONTROL REGISTER DIAGRAMS

Figure 21. Timer Mode Register

(F1

H: Read/Write)

Counter/Timer 0 Register

Figure 22. (F4

H: Read/Write)

Prescaler 0 Register

Figure 23. (F5

H: Write Only)

0 = Disable T0 Count

1 = Enable T0 Count

0 = No Function

1 = Load T0

R241 TMR

Reserved (Must be 0)

D7 D6

T0 Initial Value

(When WRITE)

(Range: 1-256 Decimal

01-00 HEX)

T0 Current Value

(When READ)

R244 T0

Count Mode

0 = T Single Pass

1 = T Modulo N

Reserved (Must be 0)

Prescaler Modulo

(Range: 1-64 Decimal

01-00 HEX)

R245 PRE0

Port 2 Mode Register

Figure 24. (F6

H: Write Only)

Port 2 Open Drain Mode Register

Figure 25. (F7

H: Write Only)

Figure 26. Interrupt Priority Register

(F9

H: Write Only)

P24-P27 I/O Definition

0 Defines Bit as OUTPUT

1 Defines Bit as INPUT

R246 P2M

Reserved

0 Port (24-27) Open-Drain

1 Port (24-27) Push-Pull

Reserved (Must be 0)

R247 P3M

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

Reserved

IRQ0, IRQ2 Priority (Group B)

0 = IRQ2 > IRQ0

1 = IRQ0 > IRQ2

IRQ1, IRQ4 Priority (Group C)

0 = IRQ1 > IRQ4

1 = IRQ4 > IRQ1

Reserved (Must be 0)

R249 IPR

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