Z87100 Datasheet, PDF (13/48 Pages) Zilog, Inc. – Wireless Transmitter

Zilog
Z87100
Wireless Transmitter
PORT Configuration Register (PCON). The PORT Con- Comparator Inputs. Port 3, P31 has a comparator front
figuration Register (PCON) configures the ports to support end where the comparator reference voltage is provided
3 ^{comparator output on Port 3, low EMI noise on Ports 2 and by P33. In analog mode, the P33 input functions as a ref-}
3, and low EMI noise oscillator. The PCON Register is lo- erence voltage to the comparators. The internal P33 regis-
cated in the Expanded Register File at bank F, location 00 ter and its corresponding IRQ1 are connected to the Stop-
(Figure 7). Bit 0 controls the comparator use in Port 3. A 1 Mode Recovery source selected by the SMR. In this mode,
in this location brings the comparator output to P35 (Figure any of the Stop-Mode Recovery sources are used to toggle
9), and a 0 releases the port to its standard I/O configura- the P33 bit or generate IRQ1. In digital mode, P33 can be
tion. Bits 5 and 6 of this register configure ports 2 and 3, used as a P33 register input or IRQ1 source (Figure 9).
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
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 V_CC, and , 50 µA if V_REF is V_DD.
When comparator is digital (Bit D1=0) the comparator is
off.
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:
s Less than 1 mA current consumption during the HALT
mode.
s The pre-drivers slew rate reduced to10 ns typical.
s Low EMI output drivers have resistance of 200 ohms
(typical).
s 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.
PCON (F) 00
D7 D6 D5 D4 D3 D2 D1 D0
Comparator
Output PORT 3
0 P35 Standard Output*
1 P35 Comparator Output
Reserved (Must be 1)
Low EMI Noise **
PORT 2
0 Low EMI Noise
1 Standard *
Low EMI Noise **
PORT 3
0 Low EMI Noise
1 Standard *
* Default Setting After Power-On Reset Only.
** Will not be reset after a Stop-Mode Recovery.
Low EMI RC Oscillator **
0 Low EMI Noise
1 Standard *
Figure 9. PORT Configuration Register (PCON)
DS96WRL0700
PRELIMINARY
3-13