ANNEX I CRequirements for construction, testing, installation, and inspection
Appendix 2
TACHOGRAPH CARDS SPECIFICATION
2.ELECTRICAL AND PHYSICAL CHARACTERISTICS
2.3.Clock generation and Frequency
TCS_07Under conditions contained into the card file EF ICC, the external clock can be stopped. The first byte of the EF ICC file body codes the Clockstop mode conditions:
Low | High | ||
|---|---|---|---|
Bit 3 | Bit 2 | Bit 1 | |
0 | 0 | 1 | Clockstop allowed, no preferred level |
0 | 1 | 1 | Clockstop allowed, high level preferred |
1 | 0 | 1 | Clockstop allowed, low level preferred |
0 | 0 | 0 | Clockstop not allowed |
0 | 1 | 0 | Clockstop only allowed on high level |
1 | 0 | 0 | Clockstop only allowed on low level |
Bits 4 to 8 are not used.