Stopxtalosc(); Description; Actions; Prototype - Infineon SP37 Function Manual

2.16

StopXtalOsc()

2.16.1

Description

This function disables the crystal oscillator clock if no other peripherals are using it. Therefore, peripherals using
the crystal oscillator should be disabled prior to calling this function.
2.16.2

Actions

• Attempt to disable the crystal oscillator clock.
2.16.3

Prototype

signed char StopXtalOsc(void)
2.16.4

Inputs

Table 74 StopXtalOsc: Input Parameters
Register / Address
None
2.16.5

Outputs

Table 75 StopXtalOsc: Output values
Register/Address
R7
2.16.6

Resource Usage

Table 76 StopXtalOsc: Resources
Type
Registers
SFR
Stack
1) Two additional bytes, not included here, are needed to call the library function
ROM Library Function Guide
Type Name
--- ---
Type Name
signed char StatusByte
Used or Modified
R7
ACC,B, CFG0, DPTR, PSW, RFS, TMOD
1)
0 Bytes
Tire Pressure Monitoring Sensor
Description
---
Description
StatusByte:
0: XTAL stopped
-1: XTAL already off (no action)
-2: XTAL not stopped because it is still needed (e.g. due to
an ongoing RF transmission)
77
SP37
ROM Library Functions
Revision 1.0, 2011-12-15