Z86C21 datasheet(24/35 Pages) ZILOG

24 / 35 page

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Z86C21 MCU

WITH

8K ROM

Serial Data (D0 = LSB)

R240 SIO

Count Mode

T1 Single Pass

T1 Modulo N

Clock Source

T1 Internal

T1 External Timing Input

(TIN) Mode

Prescaler Modulo

(Range: 1-64 Decimal

01-00 HEX)

R243 PRE1

Z8 CONTROL REGISTER DIAGRAMS

Disable T0 Count

Enable T0 Count

No Function

Load T0

No Function

Load T1

Disable T1 Count

Enable T1 Count

TIN Modes

External Clock Input

Gate Input

Trigger Input

(Non-retriggerable)

Trigger Input

(Retriggerable)

TOUT Modes

Not Used

T0 Out

T1 Out

Internal Clock Out

R241 TMR

T1 Initial Value

(When Written)

(Range: 1-256 Decimal

01-00 HEX)

T1 Current Value

(When Read)

R242 T1

T0 Initial Value

(When Written)

(Range: 1-256 Decimal

01-00 HEX)

T0 Current Value

(When Read)

R244 T0

T0 Single Pass

T0 Modulo N

Count Mode

Reserved (Must be 0)

Prescaler Modulo

(Range: 1-64 Decimal

01-00 HEX)

R245 PRE0

Figure 23. Serial I/O Register

(F0

H: Read/Write)

Figure 26. Prescaler 1 Register

(F3

H: Write Only)

Figure 28. Prescaler 0 Register

(F5

H: Write Only)

Figure 24. Timer Mode Register

(F1

H: Read/Write)

Figure 25. Counter/Timer 1 Register

(F2

H: Read/Write)

Figure 27. Counter/Timer 0 Register

(F4

H: Read/Write)

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