Manual

3
T48C862-R4
4551B–4BMCU–02/03
21 CLK Clock output signal for microcontroller
The clock output frequency is set by the
crystal to f
XTAL
/4.
22 PA_ENABLE Switches on power amplifier, used for
ASK modulation
23
24
ANT2
ANT1
Emitter of antenna output stage
Open collector antenna output
Pin Description: RF Part (Continued)
Pin Symbol Function Configuration
CLK
VS
100
100
PA_ENABLE
50k
Uref=1.1V
20 mA
ANT1
ANT2
Pin Description: Microcontroller Part
Name Type Function Alternate Function Pin No.
Reset State
V
DD
– Supply voltage – 13 NA
V
SS
– Circuit ground – 12 NA
BP20 I/O Bi-directional I/O line of Port 2.0 NTE-test mode enable, see also section "Master Reset" 7 Input
BP40 I/O Bi-directional I/O line of Port 4.0 SC-serial clock or INT3 external interrupt input 14 Input
BP41 I/O Bi-directional I/O line of Port 4.1
VMI voltage monitor input or T2I external clock input
Timer 2
9 Input
BP42 I/O Bi-directional I/O line of Port 4.2 T2O Timer 2 output 10 Input
BP43 I/O Bi-directional I/O line of Port 4.3 SD serial data I/O or INT3-external interrupt input 11 Input
BP50 I/O Bi-directional I/O line of Port 5.0 INT6 external interrupt input 17 Input
BP52 I/O Bi-directional I/O line of Port 5.2 INT1 external interrupt input 16 Input
BP53 I/O Bi-directional I/O line of Port 5.3 INT1 external interrupt input 15 Input
BP60 I/O Bi-directional I/O line of Port 6.0 T3O Timer 3 output 20 Input
BP63 I/O Bi-directional I/O line of Port 6.3 T3I Timer 3 input 6 Input
OSC1 I Oscillator input
4-MHz crystal input or 32-kHz crystal input or external
clock input or external trimming resistor input
18 Input
OSC2 O Oscillator output
4-MHz crystal output or 32-kHz crystal output or external
clock input
19 Input
NRESET I/O Bi-directional reset pin – 5 I/O