Which Afro-Asiatic branches use tone to distinguish words?

Within the Afro-Asiatic language phylum, the use of tone to distinguish between words or smaller meaningful units is attested in the following branches:

• Chadic languages: All languages in this branch utilize tonal systems, typically employing two or three tones to differentiate meaning.12
• Cushitic languages: Many languages in this division are described as tonal, incorporating two or three pitches to distinguish otherwise identical words. However, some linguists suggest that certain Cushitic languages may be more accurately characterized as having a pitch-accent system rather than a full tone system.13
• Omotic languages: Tonal distinctions are used in many Omotic languages to convey word meaning, a feature that is particularly significant due to the high frequency of monosyllabic words in this branch. Similar to Cushitic, some Omotic languages, such as Koyra, appear to utilize a pitch-accent system instead of a full tone system.14

In contrast, the use of tone is not attested in the Semitic or Amazigh branches of the Afro-Asiatic family.1