User Manual

Confidential
USERS MANUAL
17(41)
Document number Revision
4/198 17-LXE 108 566 Uen PA6
2.5 Real Time Clock (RTC) Circuit
The purpose of this section is to detail the design of incorporating the Real Time Clock
feature into the CM52.
Figure 6: RTC Functional Block Diagram
2.6 Audio Interface
The audio-related signals are: the analog audio signals
• ATMS (Audio to Mobile Station),
• AFMS (Audio from Mobile Station),
• PCM (Pulse Code Modulation) signals (PCMULD, PCMDLD, PCMCLK, and
PCMSYNC).
Pin Signal Description
7
AFMS Audio Output From Module.
10
ATMS Audio Input to Module.
9
AGND Analog Reference
17
PCMCLK PCM Clock Output from module.
18
PCMSYNC PCM Frame Sync Output from module.
19
PCMULD PCM Voice Input to module
20
PCMDLD PCM Voice Output from module.
Table 10: CM52 Audio Signals
Radio
RTC
(HH:
MM)
Application
Battery
Module_PWR_EN_B
HW_SHDN
UART
Ring Indicator