Keypad; Subscriber Identity Module (Sim) - Panasonic EB-X300 Service Manual

5.2.3. Keypad

The Keypad has a 4 x 5 matrix, allowing 18 keys to be scanned. When a key being pressed, a keypad interrupt is generated.
To find which key has been pressed, the software scans each column in turn and reads which row is active. Because of key
bounce, the key press is confirmed twice at approximately 40-60 ms intervals.
SW11
1 2
∗
[ ]
SW00
1 2
[0]
SW12
1 2
[#]
SW8
1 2
[POWER]
[END]
As the End Key doubles for the ON / OFF key, it is allocated an entire row of the keyboard scan.
Keyboard scanning is controlled by software.

5.2.4. Subscriber Identity Module (SIM)

The SIM interface is designed to support a 3 V SIM card. The nominal 2.85 V supply (VSIM) for the SIM interface is provided by
U201.
0x00 SMSMR
0x02 SMBRR
0x04 SMSCR
0x06 SMTDR
0x0A SMRDR
0x08 SMSSR
0x0C SMSCMR
SW07 SW04
1 2 1 2
[7] [4]
SW08 SW05
1 2 1 2
[8] [5]
SW09 SW06
1 2 1 2
[9] [6]
SW7 SW3
1 2 1
[SEND] [SOFT_RIGHT]
Figure 5.7. Keypad Connections
SIM Character Mode Register
SIM Bit Rate Register
SIM Control Register
SIM Data Transmit Register
SIM Data Receive Register
SIM Status register
SIM Smart Card Mode Register
SW01 SW1
1 2 1
[1] [UP]
SW02 SW2
1 2 1
[2] [DOWN]
SW03 SW4
1 2 1
[SOFT_RIGHT]
[3]
2
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
– 5-8 –
KEYCOL_0
KEYCOL_1
KEYCOL_2
KEYCOL_3
KEYCOL_4
2
KEYROW_0
2
KEYROW_1
2
KEYROW_2
KEYROW_3
POWER_KEY