Z87100 datasheet(13/48 Pages) ZILOG

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Z87100

Zilog

Wireless Transmitter

DS96WRL0700

P R E L I M I N A R Y

3-13

PORT Configuration Register (PCON). The PORT Con-

figuration Register (PCON) configures the ports to support

comparator output on Port 3, low EMI noise on Ports 2 and

3, and low EMI noise oscillator. The PCON Register is lo-

cated in the Expanded Register File at bank F, location 00

(Figure 7). Bit 0 controls the comparator use in Port 3. A 1

in this location brings the comparator output to P35 (Figure

9), and a 0 releases the port to its standard I/O configura-

tion. Bits 5 and 6 of this register configure ports 2 and 3,

respectively, for low EMI operation. A 1 in these locations

configures the corresponding port for standard operation,

and a 0 configures the port for low EMI operation. Finally,

bit 7 of the PCON Register controls the low EMI noise os-

cillator. A 1 in this location configures the oscillator with

standard drive, while a 0 configures the oscillator with low

noise drive.

Low EMI Option. The Z87100 can be programmed to op-

erate in a low EMI emission mode by the PCON register.

The RC oscillator and all I/O ports can be programmed as

low EMI emission mode independently. Use of this feature

results in:

Less than 1 mA current consumption during the HALT

mode.

The pre-drivers slew rate reduced to10 ns typical.

Low EMI output drivers have resistance of 200 ohms

(typical).

Internal SLCK/TCLK operation limited to a maximum of

4 MHz (250 ns cycle time).

With bit 7 of the PCON register, the gain of the RC oscilla-

tor may be selected: standard gain is intended for high per-

formance, high speed circuits, while the low gain option is

intended for low speed, low EMI, and low current con-

sumption applications.

Comparator Inputs. Port 3, P31 has a comparator front

end where the comparator reference voltage is provided

by P33. In analog mode, the P33 input functions as a ref-

erence voltage to the comparators. The internal P33 regis-

ter and its corresponding IRQ1 are connected to the Stop-

Mode Recovery source selected by the SMR. In this mode,

any of the Stop-Mode Recovery sources are used to toggle

the P33 bit or generate IRQ1. In digital mode, P33 can be

used as a P33 register input or IRQ1 source (Figure 9).

When P3M is programmed for analog inputs on port 3 (Bit

D1=1) that power to the comparator is on and the current

used is 300

µA if V

REF is VCC, and , 50 µA if VREF is VDD.

When comparator is digital (Bit D1=0) the comparator is

off.

Figure 9. PORT Conﬁguration Register (PCON)

Comparator

Output PORT 3

0 P35 Standard Output

1 P35 Comparator Output

Low EMI Noise **

PORT 3

0 Low EMI Noise

1 Standard

Low EMI Noise **

PORT 2

0 Low EMI Noise

1 Standard

Reserved (Must be 1)

PCON (F) 00

Low EMI RC Oscillator **

0 Low EMI Noise

1 Standard

* Default Setting After Power-On Reset Only.

** Will not be reset after a Stop-Mode Recovery.

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