Keypad; Subscriber Identity Module (Sim) - Panasonic GSM EB-A100 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.
SW 701
1 2
KEY [*]
SW 706
1 2
KEY [0]
SW 711
1 2
KEY [#]
SW 716
1 2
SOFT KEY_RIGHT
SW 718
1 2
POWERKEY & 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 3 V SIM card. And work voltage is supplied by ADP3522 "VSIM" (2.85 V).
0x00 SMSMR
0x02 SMBRR
0x04 SMSCR
0x06 SMTDR
0x0A SMRDR
0x08 SMSSR
0x0C SMSCMR
SW 702 SW 703
1 2 1 2
KEY [7] KEY [4]
SW 707 SW 708
1 2 1 2
KEY [8] KEY [5]
SW 712 SW 713
1 2 1 2
KEY [9] KEY [6]
SW 717
1 2
KEY [SEND]
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
SW 704 SW 705
1 2 1 2
KEY [1] KEY_[UP]
SW 709 SW 710
1 2 1 2
KEY [2] KEY_[DOWN]
SW 714 SW 715
1 2 1 2
SOFT KEY_LEFT
KEY [3]
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
KEYROW_0
KEYROW_1
KEYROW_2
KEYROW_3
POWER_KEY