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Z87100

PN MODULATOR WIRELESS TRANSMITTER

Zilog 

Zilog

Z87100

Wireless Transmitter

Stack. The Z87100 has an 8-bit Stack Pointer (R255) used Counter/Timers. There are two 8-bit programmable

for the internal stack that resides within the 124 general- counter/timers (T0-T1), each driven by its own 6-bit pro-

purpose registers.

grammable prescaler. The T1 prescaler can be driven by

internal or external clock sources, however, the T0 pres-

3

caler is driven by the internal clock only (Figure 14).

OSC

÷2

0

1 (SMR) D1

÷16

Internal Data Bus

Write

Write

Read

PRE0

Initial Value

Register

T0

Initial Value

Register

T0

Current Value

Register

1

0

(SMR) D0

÷4

Internal

Clock

(SCLK)

External Clock

6-Bit

Down

Counter

8-Bit

Down

Counter

÷2

IRQ4

TOUT

P36

Clock

Logic

÷4

Internal Clock

Gated Clock

Triggered Clock

TIN

P31

6-Bit

Down

Counter

8-Bit

Down

Counter

IRQ5

PRE1

Initial Value

Register

T1

Initial Value

Register

T1

Current Value

Register

Write

Write

Read

Internal Data Bus

Figure 14. Counter/Timer Block Diagram

DS96WRL0700

PRELIMINARY

3-17

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