Cpu Pin Description; Pin Description Of Cpu (Ic601 On Rf-155 Board) - Sony WRU-806B Service Manual

4-2. CPU Pin Description

4-2-1. Pin Description of CPU (IC601 on RF-155 Board)

Pin No. Pin name
1 Avcc
2 MS_DATA_IN
3 MS_DATA_OUT
4 WRU/URX
5 TEST
6 DBG
7 TXD
8 RXD
9 KEY_GP
10 KEY_CH
11 KEY_PLUS
12 KEY_MINUS
13 EEP_SDA
14 EEP_SCL
15 EEP_WP
16 NC
17 NC
18 X0
19 X1
20 Vss
21 Vcc
22 NC
23 X1A
24 X0A
25 /RST
26, 27 V3
27 V2
28 V1
29 V0
30 NC
4-2
I/O Description
_ _
I It becomes the value of the data communication line
(receiver) during Master/Subordinate (sub) and a reversed value.
O It becomes the value of the data communication line (transmitter) during
Master/Subordinate (sub) and a reversed value.
I Model selection terminal
High: WRU / Low: URX
I Tx/Rx selection terminal
. High: Tx (Operate as a transmitter)
. Low: Rx (Operate as a receiver)
I/O Input-output terminal for debugging
O Pull-up
Transmission terminal for RS232C communication
I Pull-up
Reception terminal for RS232C communication
I "Gp" key input terminal
. Low: Key on
. High: Key off
I "CH" key input terminal
. Low: Key on
. High: Key off
I "+" key input terminal
. Low: Key on
. High: Key off
I "_" key input terminal
. Low: Key on
. High: Key off
I Data terminal of IIC communication for EEPROM
O Clock terminal of IIC communication for EEPROM
O Write protection terminal of IIC communication for EEPROM
. High: Impossible
. Low: Possible
O Not used
O Not used
_ _
_ _
_ Vss
_
Vcc
O Not used
O Not used
O Not used
I _
I LCD bias
I LCD bias
I LCD bias
I LCD bias
O Not used
WRU-806B