- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
19
External EVR Chip Selection Pin Connection
Chip selection signal output from the CXD3172AR of the external EVR offers control through connection to one
of the following pins depending on the CSEVRSEL parameter setting. Initial setting is CSEVRSEL=0[h] and a
chip selection signal is outputted from pin S4.
Table 3.5-5 External EVR Chip Selection Pin Connection Settings
CSEVRSEL
(CAT12_Byte10_bit1)
Chip Selection
signal output pin
Parameter setting
Setting
value
0[h] S4
49pin
S4SEL
CAT1_Byte8_bit6-7 0[h]
1[h] P3
94pin
- - -
Multiple signals can be sent from pin S4, so additional parameter settings besides CSEVRSEL are required. To
send the chip selection signal, use the settings shown in the above table.
For output from pin P3, making CSEVRSEL=1[h] will send the chip selection signal. Thus, other parameter
settings are not required.
However, note that the following limitations apply for chip selection signal output from pin P3.
1. Pin P3 cannot be used for port driver functions.
2. The parameter settings are enabled only after the device is reset.